README extension was changed from .markdown to .md, fix metadata
README extension was changed from .markdown to .md, fix metadata

webcoyote/pivotal_workstation,Yesware/sprout,wendorf/sprout-osx-apps,webcoyote/pivotal_workstation,Yesware/sprout,1000Bulbs/pivotal_workstation,1000Bulbs/pivotal_workstation,pivotal-sprout/sprout-osx-apps,Yesware/sprout,1000Bulbs/sprout,1000Bulbs/sprout,wendorf/sprout-osx-apps,webcoyote/pivotal_workstation,pivotal-sprout/sprout-osx-apps,wendorf/sprout-osx-apps,pivotal-sprout/sprout-osx-apps