TST: add ppc64le to Travis CI matrix
TST: add ppc64le to Travis CI matrix

ahaldane/numpy,mhvk/numpy,grlee77/numpy,mhvk/numpy,madphysicist/numpy,pbrod/numpy,pizzathief/numpy,WarrenWeckesser/numpy,grlee77/numpy,shoyer/numpy,seberg/numpy,pizzathief/numpy,abalkin/numpy,WarrenWeckesser/numpy,simongibbons/numpy,seberg/numpy,anntzer/numpy,madphysicist/numpy,jakirkham/numpy,simongibbons/numpy,jakirkham/numpy,MSeifert04/numpy,jakirkham/numpy,charris/numpy,numpy/numpy,mattip/numpy,mattip/numpy,charris/numpy,rgommers/numpy,pdebuyl/numpy,MSeifert04/numpy,pbrod/numpy,jakirkham/numpy,abalkin/numpy,mhvk/numpy,pbrod/numpy,pdebuyl/numpy,jakirkham/numpy,rgommers/numpy,shoyer/numpy,madphysicist/numpy,ahaldane/numpy,madphysicist/numpy,shoyer/numpy,ahaldane/numpy,MSeifert04/numpy,grlee77/numpy,shoyer/numpy,anntzer/numpy,WarrenWeckesser/numpy,rgommers/numpy,pbrod/numpy,grlee77/numpy,endolith/numpy,jorisvandenbossche/numpy,jorisvandenbossche/numpy,pdebuyl/numpy,abalkin/numpy,endolith/numpy,ahaldane/numpy,simongibbons/numpy,charris/numpy,anntzer/numpy,seberg/numpy,anntzer/numpy,jorisvandenbossche/numpy,MSeifert04/numpy,pbrod/numpy,MSeifert04/numpy,numpy/numpy,mhvk/numpy,simongibbons/numpy,grlee77/numpy,pizzathief/numpy,WarrenWeckesser/numpy,rgommers/numpy,jorisvandenbossche/numpy,pizzathief/numpy,endolith/numpy,mattip/numpy,mattip/numpy,charris/numpy,endolith/numpy,pdebuyl/numpy,simongibbons/numpy,numpy/numpy,pizzathief/numpy,WarrenWeckesser/numpy,numpy/numpy,mhvk/numpy,madphysicist/numpy,seberg/numpy,ahaldane/numpy,shoyer/numpy,jorisvandenbossche/numpy