Move faker gem to global bundler group
Move faker gem to global bundler group

We need to create dummy data in the staging and preview environments so
move the faker gem out into the global group to allow use to run the
`rake data:generate` task in a production-like environment.

ansonK/e-petitions,oskarpearson/e-petitions,telekomatrix/e-petitions,unboxed/e-petitions,oskarpearson/e-petitions,telekomatrix/e-petitions,StatesOfJersey/e-petitions,alphagov/e-petitions,StatesOfJersey/e-petitions,unboxed/e-petitions,alphagov/e-petitions,StatesOfJersey/e-petitions,oskarpearson/e-petitions,ansonK/e-petitions,alphagov/e-petitions,telekomatrix/e-petitions,joelanman/e-petitions,alphagov/e-petitions,StatesOfJersey/e-petitions,ansonK/e-petitions,joelanman/e-petitions,joelanman/e-petitions,unboxed/e-petitions,unboxed/e-petitions