mongodb: TranscripMongoDBAdaptor methods implemented
Merge branch 'develop' into feature/web
build: PPI data from PSIMI-TAB files added
build: mongodb indexes for PPI added
mongodb: basic queries to PPI collection implemented
mongodb: web services about PPI collection implemented
build: code clean up and Ensembl databases updated to release 74
Merge branch 'develop' of github.com:opencb/cellbase into develop
build: some protein parser work from Uniprot data
Merge branch 'feature/web' of github.com:opencb/cellbase into feature/web
build: new UniProt parser implemented, protein collection is serialized from UniProt XML data
build: protein indexes for MongoDB created
build: indexes form Polyphen2 and SIFT created
mongodb: many clean ups and RegulatoryRegion API developed
all: include and exclude query params are now treated as a List not String
mongodb: RegulatoryRegion API done
Main changes:
 * null objects are not serialized to JSON
 * RegulatoryRegionParser now produces one different JSON object for each feature
 * help paramter to main method added
 * many fixes and code clean ups
Merge branch 'feature/web' of github.com:opencb/cellbase into feature/web
build: Ensembl data upgraded to version 74
build: bug fix in genome sequence parser