Update _protocol_definitions to schemas/4568e6f6
Update _protocol_definitions to schemas/4568e6f6

Issue #599

ga4gh/server,adamnovak/server,saupchurch/server,saupchurch/server,ohsu-computational-biology/server,david4096/ga4gh-server,ekalosak/server,macieksmuga/server,dcolligan/server,diekhans/ga4gh-server,pcingola/server,srblum/server,srblum/hackathon-server,dcolligan/server,diekhans/ga4gh-server,pcingola/server,srblum/server,srblum/hackathon-server,srblum/server,srblum/hackathon-server,ekalosak/server,adamnovak/server,macieksmuga/server,dcolligan/server,ga4gh/server,ga4gh/server,david4096/ga4gh-server,pcingola/server,david4096/ga4gh-server,diekhans/ga4gh-server,adamnovak/server,saupchurch/server,macieksmuga/server,ohsu-computational-biology/server,ekalosak/server,ohsu-computational-biology/server