Add Flowdock notification adapter
Update *from* email to display a valid Flowdock avatar
Flowdock doesn't validate or have some sort of confirmation for email addresses. As long as you know Flow API token you're free to post with any email.
Extract I18n key from views/layouts/application.html.haml
Extract translation key on navigation and session bar
Merge pull request #504 from nfedyashev/flowdock_notification_adapter

Conflicts:
	Gemfile.lock