CUDArt assumptions not robust

[robers97]

There is some pathing in the following file that presents errors for standard 64 bit CUDA installations in
/root/.julia/v0.5/CUDArt/src/CUDArt.jl

Symptom: Pkg.add("CUDArt") fails

In particular the line:
const libcuda = Libdl.find_library(["libcuda"], ["/usr/lib/", "/usr/local/cuda/lib"])

wants to be
const libcuda = Libdl.find_library(["libcudart"], ["/usr/lib/", "/usr/local/cuda/lib64"])

Three issues:

Since I don't have a 32bit CUDA install, I can't make a more robust suggestion than to say that the environment variable for CUDA_HOME should be checked
I suspect that the find_library command might take another path such that you could put in cuda/lib64 ahead of cuda/lib
As of at least CUDA 8, its now libcudart instead of libcuda

julia> versioninfo()
Julia Version 0.5.1-pre+31
Commit 6a1e339 (2016-11-17 17:50 UTC)
Platform Info:
System: Linux (powerpc64le-linux-gnu)
CPU: unknown
WORD_SIZE: 64
BLAS: libopenblas (NO_AFFINITY POWER8)
LAPACK: libopenblas
LIBM: libopenlibm
LLVM: libLLVM-3.9.0 (ORCJIT, pwr8)