Android: Enforce minimum SDK version
Gradle: Force link OpenSL classes

Fixes #866
Changed SDK check per comments
Added methods to build arrow and grid models
Fixed ColorPacked bug of MeshBuilder
toArray without allocation.
Added functions to generate temporary matrices
Fix to keep user transform
Merge pull request #1526 from Unkn0wn0ne/patch-2

iOS: Force linked OpenSL classes
Merge pull request #1547 from lordjone/models

MeshBuilder fixes and additions
Merge pull request #1524 from Unkn0wn0ne/master

Enforced minimum SDK version on Android
cumulative distribution
Add missing methods

Fixes #1551
Fix for Music (isPlaying when paused) on iOS
Merge pull request #1552 from obigu/master

Fix for Music (isPlaying when paused) on iOS
Added Jdoc
Fixed stageToScreenCoordinates to match old behavior.

Not sure it's right to flip the y axis, but it's what it used to do...
Merge branch 'origin/master'
Added the log about how to import to NetBeans.
Updated links.
Merge pull request #1566 from jtakakura/master

Added about supporting for NetBeans.
Update viewport for Stage constructor that doesn't take a viewport.