Added optional use of psutil
Added optional use of psutil

numba/numba,stuartarchibald/numba,numba/numba,sklam/numba,IntelLabs/numba,stonebig/numba,stonebig/numba,seibert/numba,stuartarchibald/numba,numba/numba,IntelLabs/numba,sklam/numba,seibert/numba,gmarkall/numba,stonebig/numba,gmarkall/numba,IntelLabs/numba,numba/numba,sklam/numba,seibert/numba,stonebig/numba,gmarkall/numba,gmarkall/numba,cpcloud/numba,cpcloud/numba,numba/numba,stonebig/numba,seibert/numba,sklam/numba,seibert/numba,cpcloud/numba,cpcloud/numba,IntelLabs/numba,stuartarchibald/numba,sklam/numba,IntelLabs/numba,cpcloud/numba,stuartarchibald/numba,stuartarchibald/numba,gmarkall/numba