updating gems
adding a rake task to export to google docs
improving the google docs exporter rake task
fixing db env issue on the google exported rake task
adding google exporter rake task info on the README
adding more info in the gem specification file
minor refactoring on TrelloTracker
removed useless method call
adding more info on the README
adding a spec on TrackedCard#add
Merge branch 'master' into trello_effort_app

Conflicts:
	Gemfile.lock
	Rakefile