Various minor updates

For those that have PRs waiting, please make sure they have been rebased
for this version to avoid any conflicts.
Added: Options for TVTunes and splash screen

Added option to disable the transitional splash screen and support for
the TV Tunes addon.

Option for TV Tunes can be found under Personalize > 3rd party addons.
Option for Splash screen can be found under Personalize >
Visualisations.
Fix: Shutdown option

Closes PR #37
Update: Various cosmetic changes
Fix: Closes Issue #40

Thanks to JMarshall for pointing out the cause of the crashing
experienced on the OpenElec build.
Added: Support for Fanart Grabber addon

Adds randomized fanart to the home screen as an option. Can be enabled
by going to  Personalize > Backgrounds > 'Use random fanart for
background'.

Grab the addon here: https://github.com/robweber/script.grab.fanart/
Fix: Alignment issues with subtitle ratings
Update: Lower opacity of background overlay
Fix: Trakt.tv similar and comments not updating
Fix: Big Picture support

Updated Big Picture support due to changes in the addon
Update: Cosmetic changes for the music visualiser

Added zoom / pan effect to artist fanart. Also changed the timings on
the text scroll basing it on system time instead of the player time.
Hopefully reduces some of the overhead causing lag on some low power
devices.

I'll add an option to disable it entirely soon.
Added: Skinned the TextViewer window

ie: Changelog window for addons, etc.
Cleaned: Unnecessary code breaks / text
Add tvTunes if add-on is installed and setting enabled
Add setting for TVtunes
String for Tv Tunes - Skipped a number so to not conflict with the pending pull of disabling splash screens
Merge branch 'master' of https://github.com/hessius/skin.immersive