Lr add city

* Adds 'city' field to meetup search so meetup searches don't default to server location. Without this, searches were defaulting to meetups located in the Seattle area.
* Adds ember-easyForm
* Adds ember-validations
* Modifies GroupsController#index to take a location parameter

* Update eak-rails to latest version
* Adds error message if config/secrets.yml is not present