Ux 2013 01 18 cherry picked

* [Bug 825825](https://bugzilla.mozilla.org/show_bug.cgi?id=825825) - Remove some unnecessary CSS from music.css
* [Bug 822310](https://bugzilla.mozilla.org/show_bug.cgi?id=822310) - [Gaia] Fix outdated or broken iconography across all Gaia apps and system folders
* [Bug 808894](https://bugzilla.mozilla.org/show_bug.cgi?id=808894) - [BB][Browser] Apply building blocks [input_areas]
* [Bug 827780](https://bugzilla.mozilla.org/show_bug.cgi?id=827780) - Apply hit state to keyboard buttons in lockscreen passcode entry.
* [Bug 827931](https://bugzilla.mozilla.org/show_bug.cgi?id=827931) - [B2G][Clock]Edit Mode: X icon for cancel edit not shown it show the back < arrow.
* [Bug 828933](https://bugzilla.mozilla.org/show_bug.cgi?id=828933) - [Settings] - Need to change all CSS rules to our Coding style guidelines.
* [Bug 831439](https://bugzilla.mozilla.org/show_bug.cgi?id=831439) - Wallpaper shifts up when transitioning from Locksreen to Homescreen
* [Bug 816081](https://bugzilla.mozilla.org/show_bug.cgi?id=816081) - [Status Bar] Swap positions of "downloading" and "network activity" icons
* [Bug 828251](https://bugzilla.mozilla.org/show_bug.cgi?id=828251) - Unbranded Version of the OS needs approved graphics
* [Bug 822687](https://bugzilla.mozilla.org/show_bug.cgi?id=822687) - Bluetooth transfer icon cut off and misaligned
* [Bug 796304](https://bugzilla.mozilla.org/show_bug.cgi?id=796304) - [Music] Generic Album Art needs to be Created
* [Bug 808250 Fix](https://bugzilla.mozilla.org/show_bug.cgi?id=808250) - In Display settings, the icons for brightness slider seem flipped to people