Merge branch 'crossfader'

* crossfader:
  Fixup crossfader gem installation
  Refactor crossfader into a full gem
  Install base gemset for each config that has a gemfile
  Install trollop to crossfader gemset
  Stop using bundler because it interferes with gem installation
  Add minimally functional crossfader command
  Install crossfader script and package in the gems
  Fix rake task unable to execute commands
  Fix backline package name
  Update crossfader gemspec summary and description
  Add crossfader gem scaffold from bundler
  Package crossfader runtime gemset
  Add xfade-run script to setup environment
  Remove pvm script no longer needed