Preventing a JS error on bookmarks#index because of the variable APP
being undefined. This variable will only be defined and used on pages
having a bookmark form.
Integrated Poltergeist for integration tests dependent on JS execution.
JS errors will also be caught more easily as they're thrown during testing.
This results in a dependency on PhantomJS as Poltergeist is a PhantomJS
driver for Capybara.
Integration test "starting to type a tag will provide autocomplete
suggestions".
Merge branch 'topic/tagging_enhancements' into bogns_setup

Conflicts:
	Gemfile.lock