updated beacon.avro to 0.2 spec
updated beacon.avro to 0.2 spec

dglazer/schemas,sarahhunt/schemas,delagoya/schemas,macieksmuga/schemas,dcolligan/schemas,nlwashington/schemas,sarahhunt/schemas,Jeltje/ga4gh-schemas,dnanexus-rnd/schemas,delagoya/schemas,Jeltje/ga4gh-schemas,lh3/schemas,pcingola/schemas,nlwashington/schemas,kellrott/schemas,ga4gh/ga4gh-schemas,dnanexus-rnd/schemas,buske/schemas,laserson/schemas,diekhans/ga4gh-schemas,saupchurch/schemas,adamnovak/schemas,diekhans/ga4gh-schemas,heuermh/ga4gh-schemas,hjellinek/schemas,kellrott/schemas,adamnovak/schemas,hjellinek/jeltje-schemas-sphinx,benedictpaten/schemas,buske/schemas,laserson/schemas,ga4gh/schemas,hjellinek/schemas,benedictpaten/schemas,lh3/schemas