Merge pull request #95 from chen3feng/develop

Develop
Fix dependancy bug of genrule
initialize support for CUDA compiler
Merge pull request #100 from chen3feng/fix-genrule-dep

Fix dependancy bug of genrule
Merge pull request #101 from buaaliyi/cuda-support

initialize support for CUDA compiler
Fix cu_library merge bug
Fix cu_library merge bug