Add gepetto_hooks gemspec

Without this patch the dependencies in Bundler aren't resolving
properly.  This patch addresses the problem by allowing the library
itself to be referenced in bundle.
Update bundle gemfile and lockfile

Without this patch the bundle doesn't reference the gepetto_hooks gem.
This patch updates the gemfile to resolve dependencies.
Add require 'gepetto_hooks'; j = PuppetLabs::TrelloSummaryJob.new