Remove Gemfile.lock

The locked bosh gems are deleted regularly from Pivotal's s3
account; which breaks the Gemfile.lock. I don't think there
is a useful purpose to the lock file in the context of
cf-release.
Merge branch 'no_gemfile_lock' of git://github.com/drnic/cf-release into drnic-no_gemfile_lock

Conflicts:
	Gemfile.lock
	src/gorouter/src/github.com/cloudfoundry/go_cfmessagebus
	src/gorouter/src/github.com/cloudfoundry/gorouter
	src/gorouter/src/github.com/cloudfoundry/gosteno
	src/gorouter/src/github.com/cloudfoundry/yagnats
	src/gorouter/src/github.com/rcrowley/go-metrics