Merge branch 'goban'

Conflicts:
	app/build.gradle
	app/src/main/java/org/kastberg/stlviewer/STLRenderer.java
	app/src/main/res/values/strings.xml
Merge remote-tracking branch 'origin/master'

Conflicts:
	app/build.gradle
	app/src/main/java/org/kastberg/stlviewer/STLModel.java
	app/src/main/java/org/kastberg/stlviewer/STLNode.java
	app/src/main/java/org/kastberg/stlviewer/STLRenderer.java
	app/src/main/java/org/kastberg/stlviewer/STLSceneGraph.java
	app/src/main/java/org/kastberg/stlviewer/STLSurfaceView.java
	app/src/main/java/org/kastberg/stlviewer/STLTexture.java