Document long running branch workflow
Document long running branch workflow

Issue #849

david4096/ga4gh-server,david4096/ga4gh-server,dcolligan/server,macieksmuga/server,ga4gh/server,david4096/ga4gh-server,dcolligan/server,macieksmuga/server,ohsu-computational-biology/server,saupchurch/server,saupchurch/server,ohsu-computational-biology/server,ga4gh/server,ga4gh/server,saupchurch/server,dcolligan/server,ohsu-computational-biology/server,macieksmuga/server