Add expm1 test
Add expm1 test

seibert/numba,gmarkall/numba,gdementen/numba,IntelLabs/numba,ssarangi/numba,pombredanne/numba,seibert/numba,stuartarchibald/numba,stefanseefeld/numba,pombredanne/numba,stuartarchibald/numba,stefanseefeld/numba,pitrou/numba,GaZ3ll3/numba,gmarkall/numba,stonebig/numba,stonebig/numba,seibert/numba,pombredanne/numba,shiquanwang/numba,numba/numba,IntelLabs/numba,ssarangi/numba,sklam/numba,ssarangi/numba,GaZ3ll3/numba,GaZ3ll3/numba,pombredanne/numba,cpcloud/numba,gmarkall/numba,pitrou/numba,IntelLabs/numba,numba/numba,GaZ3ll3/numba,numba/numba,gmarkall/numba,stefanseefeld/numba,seibert/numba,sklam/numba,ssarangi/numba,numba/numba,stefanseefeld/numba,shiquanwang/numba,numba/numba,stonebig/numba,sklam/numba,jriehl/numba,pombredanne/numba,pitrou/numba,jriehl/numba,GaZ3ll3/numba,stuartarchibald/numba,jriehl/numba,stonebig/numba,pitrou/numba,stonebig/numba,sklam/numba,gdementen/numba,gdementen/numba,seibert/numba,cpcloud/numba,gdementen/numba,jriehl/numba,gdementen/numba,cpcloud/numba,jriehl/numba,cpcloud/numba,stuartarchibald/numba,gmarkall/numba,stefanseefeld/numba,ssarangi/numba,pitrou/numba,cpcloud/numba,IntelLabs/numba,shiquanwang/numba,IntelLabs/numba,stuartarchibald/numba,sklam/numba