fatcubin x86/x86-64 generation and loading.

* split CompiledKernel.getCubin() into getCubin32 and getCubin64 for x86/x86-64 bit architectures
* generate two files from cuda code, prefixed with -32 and -64, for x86 and x86-64 bit respectively
Merge pull request #82 from amiftah/features/multi_fatcubin

fatcubin x86/x86-64 generation and loading.