Increase tolerance for erf and erfc tests due to OS X libm behavior
Increase tolerance for erf and erfc tests due to OS X libm behavior

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