Destinations management update
Merge branch 'develop' into single_destination

Conflicts:
	Gemfile
	Gemfile.lock
	app/assets/javascripts/application.js
	app/assets/javascripts/rails.validations.js
	app/assets/javascripts/rails.validations.simple_form.js
	app/assets/javascripts/trips.js.coffee
	app/assets/stylesheets/application.css
	app/assets/stylesheets/gmaps4rails.css
	app/controllers/destinations_controller.rb
	app/views/trips/_form.html.slim
	app/views/trips/new.html.slim
	app/views/trips/show.html.slim
	config/initializers/client_side_validations.rb