Add a way to display feedbacks to user
Add references into headers of fixtures
Improve logging when Cozy instance goes down
Refactoring of alert messages
Send emails
Merge branch 'master' of https://github.com/cozy/cozy-emails

Conflicts:
	client/app/actions/LayoutActionCreator.coffee
	client/app/components/application.coffee
	server/controllers/messages.coffee
Hide compose window after send + code cleaning
More code cleanup & bugfixes
Merge pull request #19 from clochix/master

Messages compose and send