ComputeCapabilityVersion 1.2 Support and install maven file

Modified pack-rootbeer (add install maven file)
Added support for ComputeCapabilityVersion 1.2
Added getGpuCards feature to Rootbeer

Added maven dependency install script
Compiled native code
Added setCurrentGpuCard(GpuCard gpuCard) feature

Modified getBestDevice()
Merge pull request #95 from millecker/feature/rbclassload2

merging changes to support multiple GPUs.