Updated simple_uniprot preprocessor to work properly with GENCODE.
Minor changes to get the two other uniprot datasource preprocessing scripts up and running.
Minor fixes to uniprot aa annotation preprocessing script.
Trivial change to address issue #222: UniProt GO annotations do not include ID field
More example scripts and removed leveldb references initializeDatasource
Updating example script to produce the uniprot AA xform datasource nearly automatically.
Added unit tests for new uniprot and ensured backwards compatibility.
Added new uniprot test to test some troublesome variants.
Addressing pull request comments.
Merge pull request #254 from broadinstitute/issue-127-uniprot_gencode

fixes Issue #127 uniprot gencode
Using APPRIS tags during transcript selection
See issue #231 for more info
Misc:
adding gencode19 datasources to testdata
adding a checking that ref AND alt don't both == "-" in infer_variant
wiring tx_mode option for gencode in TestUtils which currently didn't do anything