Add unit test for unicode join
Add unit test for unicode join

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