Pluginsv2

Change format of returned source tree list from a string array to the following (suggested by @mtholder):
```json
{
  "root_node_id" : 132,
  "study_list" : [ {
    "study_id" : "pg_2827",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6577"
  }, {
    "study_id" : "pg_761",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "1415"
  }, {
    "study_id" : "pg_77",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "5878"
  }, {
    "study_id" : "pg_754",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "1392"
  }, {
    "study_id" : "pg_330",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "325"
  }, {
    "study_id" : "pg_1131",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2265"
  }, {
    "study_id" : "pg_2608",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6288"
  }, {
    "study_id" : "pg_2539",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6294"
  }, {
    "study_id" : "pg_2645",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6165"
  }, {
    "study_id" : "pg_2644",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6164"
  }, {
    "study_id" : "pg_2642",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6161"
  }, {
    "study_id" : "pg_2626",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6142"
  }, {
    "study_id" : "pg_332",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "333"
  }, {
    "study_id" : "pg_2832",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6586"
  }, {
    "study_id" : "pg_1866",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "3765"
  }, {
    "study_id" : "pg_59",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "5731"
  }, {
    "study_id" : "pg_704",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "1266"
  }, {
    "study_id" : "pg_2638",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6157"
  }, {
    "study_id" : "pg_1974",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "4038"
  }, {
    "study_id" : "pg_1974",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "4039"
  }, {
    "study_id" : "pg_2901",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6721"
  }, {
    "study_id" : "pg_2906",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6730"
  }, {
    "study_id" : "pg_1524",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "3046"
  }, {
    "study_id" : "pg_1414",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2837"
  }, {
    "study_id" : "pg_1411",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "5110"
  }, {
    "study_id" : "pg_1409",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2822"
  }, {
    "study_id" : "pg_1408",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2821"
  }, {
    "study_id" : "pg_1407",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2818"
  }, {
    "study_id" : "pg_1401",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2812"
  }, {
    "study_id" : "pg_1391",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2795"
  }, {
    "study_id" : "pg_1434",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2876"
  }, {
    "study_id" : "pg_2633",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6153"
  }, {
    "study_id" : "pg_1539",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "3088"
  }, {
    "study_id" : "pg_2634",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6154"
  }, {
    "study_id" : "pg_1022",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "1967"
  }, {
    "study_id" : "pg_562",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "817"
  }, {
    "study_id" : "pg_588",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "878"
  }, {
    "study_id" : "pg_2048",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "4220"
  }, {
    "study_id" : "pg_1137",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2295"
  }, {
    "study_id" : "pg_62",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2878"
  }, {
    "study_id" : "pg_2841",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6597"
  }, {
    "study_id" : "pg_2085",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "4317"
  }, {
    "study_id" : "pg_180",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "794"
  }, {
    "study_id" : "pg_576",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "849"
  }, {
    "study_id" : "pg_581",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "859"
  }, {
    "study_id" : "pg_582",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "862"
  }, {
    "study_id" : "pg_598",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "926"
  }, {
    "study_id" : "pg_599",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "927"
  }, {
    "study_id" : "pg_603",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "940"
  }, {
    "study_id" : "pg_721",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "1298"
  }, {
    "study_id" : "pg_723",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "1300"
  }, {
    "study_id" : "pg_921",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "4103"
  }, {
    "study_id" : "pg_61",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "816"
  }, {
    "study_id" : "pg_573",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "839"
  }, {
    "study_id" : "pg_566",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "832"
  }, {
    "study_id" : "pg_1522",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "3044"
  }, {
    "study_id" : "pg_1570",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "3142"
  }, {
    "study_id" : "pg_1583",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "3194"
  }, {
    "study_id" : "pg_1572",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "3145"
  }, {
    "study_id" : "pg_2909",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6735"
  }, {
    "study_id" : "pg_43",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "3862"
  }, {
    "study_id" : "pg_38",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "1750"
  }, {
    "study_id" : "pg_2878",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6673"
  }, {
    "study_id" : "pg_2624",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6139"
  }, {
    "study_id" : "pg_2128",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "4437"
  }, {
    "study_id" : "pg_1102",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2177"
  }, {
    "study_id" : "pg_1129",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2251"
  }, {
    "study_id" : "pg_1109",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2201"
  }, {
    "study_id" : "pg_2004",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "4118"
  }, {
    "study_id" : "pg_53",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "1280"
  }, {
    "study_id" : "pg_1118",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2226"
  }, {
    "study_id" : "pg_2669",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6213"
  }, {
    "study_id" : "pg_2032",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "5922"
  }, {
    "study_id" : "pg_1901",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "3877"
  }, {
    "study_id" : "pg_713",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "1287"
  }, {
    "study_id" : "pg_2912",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6740"
  }, {
    "study_id" : "pg_259",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "142"
  }, {
    "study_id" : "pg_264",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "150"
  }, {
    "study_id" : "pg_267",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "161"
  }, {
    "study_id" : "pg_2077",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "4291"
  }, {
    "study_id" : "pg_293",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "201"
  }, {
    "study_id" : "pg_197",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "784"
  }, {
    "study_id" : "pg_595",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "896"
  }, {
    "study_id" : "pg_131",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6236"
  }, {
    "study_id" : "pg_2689",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6241"
  }, {
    "study_id" : "pg_597",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "906"
  }, {
    "study_id" : "pg_2001",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "4100"
  }, {
    "study_id" : "pg_606",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "5290"
  }, {
    "study_id" : "pg_270",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "159"
  }, {
    "study_id" : "pg_596",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "901"
  }, {
    "study_id" : "pg_294",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "202"
  }, {
    "study_id" : "pg_292",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "199"
  }, {
    "study_id" : "pg_58",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "775"
  }, {
    "study_id" : "pg_548",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "798"
  }, {
    "study_id" : "pg_2055",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "4234"
  }, {
    "study_id" : "pg_2057",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "4240"
  }, {
    "study_id" : "pg_2127",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "4426"
  }, {
    "study_id" : "pg_594",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "890"
  }, {
    "study_id" : "pg_261",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "145"
  }, {
    "study_id" : "pg_57",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "777"
  }, {
    "study_id" : "pg_1087",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2114"
  }, {
    "study_id" : "pg_1087",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2115"
  }, {
    "study_id" : "pg_2690",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6243"
  }, {
    "study_id" : "pg_2045",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "4213"
  }, {
    "study_id" : "pg_605",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "947"
  }, {
    "study_id" : "pg_271",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "5017"
  }, {
    "study_id" : "pg_2661",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6198"
  }, {
    "study_id" : "pg_2052",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "4228"
  }, {
    "study_id" : "pg_1103",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2178"
  }, {
    "study_id" : "pg_14",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "12"
  }, {
    "study_id" : "pg_2598",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6020"
  }, {
    "study_id" : "pg_2000",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "4098"
  }, {
    "study_id" : "pg_20",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2162"
  }, {
    "study_id" : "pg_1101",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2172"
  }, {
    "study_id" : "pg_2565",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "5708"
  }, {
    "study_id" : "pg_1094",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "2138"
  }, {
    "study_id" : "pg_2641",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6160"
  }, {
    "study_id" : "pg_99",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "5885"
  }, {
    "study_id" : "pg_93",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "1411"
  }, {
    "study_id" : "pg_898",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "1732"
  }, {
    "study_id" : "pg_216",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "5865"
  }, {
    "study_id" : "pg_901",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "1740"
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  }, {
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  }, {
    "study_id" : "pg_313",
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    "tree_id" : "6681"
  }, {
    "study_id" : "pg_2484",
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    "tree_id" : "6607"
  }, {
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    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
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  }, {
    "study_id" : "pg_2822",
    "git_sha" : "a2c48df995ddc9fd208986c3d4225112550c8452",
    "tree_id" : "6569"
  }, {
    "study_id" : "taxonomy",
    "git_sha" : "",
    "tree_id" : ""
  } ],
  "root_taxon_name" : "cellular organisms",
  "num_source_studies" : 484,
  "taxonomy_version" : "2.8_5",
  "root_ott_id" : 93302,
  "num_tips" : 2339460,
  "date" : "Sun Sep 14 01:27:06 EDT 2014",
  "tree_id" : "otol.draft.22"
}
```
There is an optional argument ```list_sources``` which defaults to ```true```.

I've talked to @jar398 about maybe making this a separate service in the future, but at the moment it is just a better version of the existing service.

Would you like to merge @mtholder?