New menu for the mobile version

This pull request contains the work of @taratatach and myself.
It adds a drawer to the mobile version, allowing the user to do actions which was hard to access before (aspects stream, log out, toggle mobile, contacts, settings, search and activity stream...)

![screen](https://f.cloud.github.com/assets/930064/1851417/1dbd1ac0-76e9-11e3-946b-eb25b2ac7e0d.png)

We also change the header menu, which is now way more easy to click, and change the icon to white to have a bigger contrast (useful when your outside with your mobile)

![menu-after](https://f.cloud.github.com/assets/930064/1851416/1da14412-76e9-11e3-9809-670f967cac8d.png)

Bonus: when you're in the drawer, you now have a direct access to the search field :D