add support for doing analysis in ArcGIS Online

a couple different things needed to be fixed to get analysis in AGOL online working.

1. make sure we invoke bodyParser() before we start debugging
2. dig parameters not just out of request url, out also POST body
3. remove global rest/info and rest/services routes (because the url of rest/info is determined on the fly based on the FeatureServer url
4. test the value of returnIdsOnly as a string

it'll also be necessary to merge a PR on individual providers to create appropriate rest/info route handlers, but i want to get some feedback from that team to see what the minimum we can get away with is before we merge.

as of right now, my heroku instance isn't returning the appropriate features for queries by extent, but koop.dc.esri is, so i think after a merge, we'll be good to go.