Removes duplicate from Gemfile and arranges groups

There were duplicate entries in the Gemfile that were causing warnings.
The duplicates were removed and the gems were placed in their correct
groups.
Merge pull request #65 from 18F/feature/remove_duplicate_entries_from_gemfile

Removes duplicate from Gemfile and arranges groups
Added breadcrumbs to articles, web services

Conflicts:
	Gemfile.lock
Updated breadcrumbs for guides, categories, about
Added test coverage for new breadcrumbs
Added breadcrumbs to articles, web services

Conflicts:
	app/controllers/quick_answers_controller.rb
Updated breadcrumbs for guides, categories, about