Update gems
Remove wikipedia-client gem
Remove Commontator models and controllers

Re-insert them if you need the ones used by the engine.
Standardise all references to all_interrelated_notes_and_features
Fix cropped last lines in paragraph (parallel mode)
Ajaxify user menu and flash notices to make page caching possible

Unable to get tests working, even using capybara-webkit.
Fix feature breadcrumb
Change inline instructions to braced paragraphs e.g. {cap: Caption}