Merge pull request #1 from libgdx/master

Update
Added useRealSizeKnobs to ScrollPane, which indicates if knobs are
scaled or real sized by physical width and height of the image
Renamed knob size variable
Merge pull request #1509 from badazdz/master

ScrollPane using real sized knobs
Javadoc
Removes MinMaxViewport, ExtendViewport with max dimensions does the job instead
Removed MinMaxViewport names.
Javadocs
Javadoc
Added viewports.
fixed jnilib issues with gradle/java8 the worst possible way..
fixed up robovm eclipse project generation via gradle, updated to latest android gradle plugin
gradle and eclipse work now, mostly been fixing robovm eclipse and cli
Simplify Intersector#intersectRaySphere
fixed up some minor things regarding gwt
Exclude incompatible tests from GWT
cleaned up gradle template, moved platform specific stuff to platform build.gradle files
Merge branch 'master' of https://github.com/libgdx/libgdx
Android: Enforce minimum SDK version
fixed up content root issue and other things. simplified gradle build files. eclipse users now need to set working dir for desktop run configuration