put low level api calls in OpeCL api module
put low level api calls in OpeCL api module

JuliaPackageMirrors/OpenCL.jl,tkelman/OpenCL.jl,yuyichao/OpenCL.jl,yuyichao/OpenCL.jl,tkelman/OpenCL.jl,JuliaPackageMirrors/OpenCL.jl