chat UI
Merge branch 'devel' of github.com:Meta-arviointi/meta-arviointi into devel

Conflicts:
	app/webroot/css/meta.css
implemented chat backend
hide chat window when not logged in, closes #43
fixed js error when not having chat messages in database
fixed header layout bug in firefox
50px treshold for automatic chat window scrolling on refresh
improved chat js
Handled information in action, if set to handled
added skeleton for admin users view.
Merge branch 'devel' of github.com:Meta-arviointi/meta-arviointi into devel
Action forms to elements + datepicker, TODO deadline
Merge branch 'devel' of github.com:Meta-arviointi/meta-arviointi into devel
Course listing + adding course works /admin/courses/ ++ User listing + adding new users works (needs work tho) /admin/users
added missing file from previous commit :-p
fix logout link url generation in admin actions
fixed bug in chat refreshing, no more parallel requests
chat bugfixes
Saving actions now works with datepicker
Save last login-time when users logs in