New icon proposition and some other small things

Changelog:
Added new icon; more in line with the mobile app icon

added: press 'space' to play/pause; gives it a more native app feeling (the Spotify desktop app has this, as well as iTunes) 

added: hide trial div at home page (still visible in settings, of course), I wanted to hide this because it was overlaying with some UI elements on some pages (see screenshot)
While doing this I also disabled the scrolling of the page when space is pressed (again, a more native app feeling, less web feeling)

![screen shot 2014-11-09 at 03 10 59](https://cloud.githubusercontent.com/assets/1129119/4966236/d051a760-67b5-11e4-9905-15f06d895c84.png)