fixes and features

- fixed double vision issue
- added customizable pupil distance setting
- fixed rendering overlap issue
- Improved launching animation
- Made non-selected apps grayscale
- increased width of center divider
removed unused import
added rotational reset feature and starts of volume panel
Added blacklist for apps to not display.

Also, the volume panel is in progress in this version. It’s pretty
broken though.
There is also a glitch in the rotational reset where it doesn’t wrap
around properly
The volume panel works now, just not quite accurately

The graphical slider on the volume panel appears too far to the right
and appears to be shorter than the computed one.
The volume setting functionality now works though, so that’s good.
New features

- Added volume adjustment slider
- Added option to disable hardware volume buttons (some phones have
issues with volume button pressing while in Cardboard
- Added a way to reset the view. This is done by pulling the magnetic
ring when nothing is selected
- Added blacklist to keep apps from showing up that you don't want

These suggestions are all thanks to the people over at Reddit
http://www.reddit.com/r/GoogleCardboard/comments/2fx40a/a_few_days_ago_i
_released_my_new_app_cardboard/
Potential fixes for bugs reported by Google Play users

Fix for Null pointer on headTracker (line 539 of Launcher.java)
Fix for Null pointer on recognizerIntent (line 285 of Launcher.java)
Partial fix for another reported bug.
Merge branch 'Dev-Branch'