Simplify Intersector#intersectRaySphere
Android: Enforce minimum SDK version
shrink returns items.
Gradle: Force link OpenSL classes

Fixes #866
Changed SDK check per comments
Fixed over after a click. Added "visual" pressed so a click within a single frame isn't missed.
Fix GWT task running out of order

Fixes #1541
Formatting consistency
Fixed padding being lost.

#796
Added getImageCell.

#1536
Added unitsPerPixel to ScreenViewport.

#1539
Merge branch 'origin/master'
Merge pull request #1523 from xoppa/various

Simplify Intersector#intersectRaySphere
Add local properties to define sdk location
Tabs apparently...
Spaces > Tab
Use actual simple name

Fixes #1543
Merge pull request #1542 from Tom-Ski/uibranch

Sets up the local.properties (Useful for intellij users)
Add local.properties to gitignore
iOS: Remove all GL 1.x references from todos.txt

Address what #3a61732 didn't cover