Add meta data to HTML head

Fixes bug #481.
Merge pull request #564 from nschloe/add-metadata

Add meta data to HTML head
Autofocused username when login form is rendered
Autofocused e-mail when forgot password form is rendered
Autofocused e-mail on enroll user form
Fixed search autofocus so that it doesn't take focus away from dialogs
Style.
Merge pull request #568 from peerlibrary/autofocus-username-on-login

Autofocus username when login form is rendered
Merge branch 'development' into rename-event-variables

Conflicts:
	client/accounts.coffee