add tests to check if whitespaces are ignored in gufunc signatures
add tests to check if whitespaces are ignored in gufunc signatures

anntzer/numpy,simongibbons/numpy,simongibbons/numpy,mattip/numpy,endolith/numpy,jakirkham/numpy,seberg/numpy,seberg/numpy,jakirkham/numpy,mattip/numpy,pdebuyl/numpy,jakirkham/numpy,endolith/numpy,seberg/numpy,mhvk/numpy,numpy/numpy,rgommers/numpy,anntzer/numpy,mhvk/numpy,pdebuyl/numpy,mhvk/numpy,seberg/numpy,jakirkham/numpy,endolith/numpy,mhvk/numpy,endolith/numpy,charris/numpy,rgommers/numpy,rgommers/numpy,simongibbons/numpy,charris/numpy,charris/numpy,anntzer/numpy,jakirkham/numpy,numpy/numpy,numpy/numpy,rgommers/numpy,mattip/numpy,simongibbons/numpy,mattip/numpy,numpy/numpy,mhvk/numpy,simongibbons/numpy,charris/numpy,pdebuyl/numpy,pdebuyl/numpy,anntzer/numpy