-New Login screen
-Action logging added but deactivated
-Offline.js integration
-general ui updates
-Libraries
-Commented out action logging
-Added IDs to tabs links (to catch up with master)
Merge pull request #82 from react-epfl/ILS_Login+Notifications

Ils login+notifications

- Providing action logging according the ActionLogger library of UT
- Notifying ILS users (on student view) when internet connection is out
- Internationalization for some messages
- Providing a new Log In page