Add cl_kernel_getinfo_async test
Add cl_program_createKernel_async test
Add cl_program_createKernelsInProgram_async test
Add cl_kernel_getArgInfo_async test
Add cl_program_getBuildInfo_async test
Merge pull request #77 from goberle/upstream

Add asynchronous mode for long-running functions in many tests.

Looks good to me. Pulling it into master.