Added docs describing branch strategy
Added docs describing branch strategy

Issue #333

srblum/server,srblum/hackathon-server,srblum/hackathon-server,hjellinek/server,saupchurch/server,dcolligan/server,dcolligan/server,UMMS-Biocore/ga4gh-server,pansapiens/server,srblum/hackathon-server,ga4gh/server,pcingola/server,diekhans/ga4gh-server,ohsu-computational-biology/server,ohsu-computational-biology/server,pansapiens/server,srblum/server,saupchurch/server,macieksmuga/server,macieksmuga/server,macieksmuga/server,ga4gh/server,adamnovak/server,adamnovak/server,ekalosak/server,diekhans/ga4gh-server,UMMS-Biocore/ga4gh-server,pcingola/server,hjellinek/server,shajoezhu/server,adamnovak/server,ekalosak/server,dcolligan/server,ekalosak/server,srblum/server,david4096/ga4gh-server,pcingola/server,diekhans/ga4gh-server,pansapiens/server,david4096/ga4gh-server,saupchurch/server,david4096/ga4gh-server,shajoezhu/server,ga4gh/server,ohsu-computational-biology/server,UMMS-Biocore/ga4gh-server,hjellinek/server