Query elasticsearch by month indexes.

The daily indexes turned out to be a bit too granular.
Remove dependency on yui-compressor since Sass will already compress things.
Add some temporary benchmark endpoints.
Revamp admin login process to allow other login mechanisms.

Since not everyone that needs access to api.data.gov has MAX.gov, now
supporting MAX.gov, MyUSA, Google, and Persona.

Conflicts:
	Gemfile
	Gemfile.lock
	app/controllers/admin_sessions_controller.rb
	config/initializers/devise.rb
dotenv setup for storing production configuration (for oauth credentials)

Conflicts:
	config/deploy/production.rb
	config/deploy/staging.rb
Show e-mail addresses in unique users list. Make unique facets clickable.
Sort log results by timestamp.
Add ability to edit api users to control rate limit settings.

Conflicts:
	app/views/admin/api_users/index.html.erb
Fix facet links when no other filters were previously applied.
Don't show the host in the request table listing. Make URLs clickable.
Sync a few small things back from the gsa branch.
Bump the devise and simple_form gems.