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.
fixed gwt name issue, fixed file dialog issue
Merge branch 'master' of https://github.com/libgdx/libgdx
more fixes to gwt
Update todos.txt

GL1X bindings no longer included in libgdx...
Merge pull request #1533 from k00p/patch-1

Update todos.txt
Update ProgressBar.java
knobBefore properly drawn

Fixes an issue with knobBefore when there's no knob (typical progress bar)
Merge pull request #1535 from cortobass/master

knobBefore properly drawn
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