Add bootstrap 3, make it available for stylesheets

[ci skip]
Revert "Add silly endpoint rendering "sendgrid" text"

This reverts commit d34bd74ee225e193638a8389a8eae2de16acc7e8.
Merge remote-tracking branch 'origin/master' into omniauth-strategy

Conflicts:
	Gemfile.lock
	app/assets/stylesheets/application.css
	config/routes.rb