Upgrade mobidevelop-robovm to 2.3.1, GWT to 2.8.1.
<android.version>4.1.1.4</android.version>
<android.maven.version>4.2.1</android.maven.version>
<swt.version>4.5.1</swt.version>
- <gwt.version>2.8.0</gwt.version>
+ <gwt.version>2.8.1</gwt.version>
<jbox2d.version>2.2.1.1</jbox2d.version>
<lwjgl.version>3.0.0</lwjgl.version>
<lwjgl2.version>2.9.3</lwjgl2.version>
- <robovm.version>2.3.0</robovm.version>
+ <robovm.version>2.3.1</robovm.version>
<bugvm.version>1.1.5</bugvm.version>
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