[bindings] add test code for a range of swig versions
[bindings] add tests for swig versions 1.3.39 1.3.40
Change status type from int to nite::SkeletonState in all getSkeletonState(int) methods
Quit OpenNI2DeviceServer if sensor cannot be found or cannot be initialized
Remove bool argument from updateInterface() (obsolete concept from OpenNIv1.x)
Remove getSkeletonState() method
Clean up unused commented code
Add parameter for minimum confidence