MAINT: remove legacy monkeypatching of GzipFile
MAINT: remove legacy monkeypatching of GzipFile

I'm not sure exactly when GzipFile.seek started supporting the whence=
argument by default -- sometime around python 2.5 from the looks of
http://bugs.python.org/issue1355023. But in any case it was definitely
there by 2.6, which is now the earliest version we support, so there's
no longer any need to monkeypatch it in. This also fixes an error in
python 3.5b2, which I haven't bothered to track down further because
these are the wages of monkeypatching.

mathdd/numpy,Dapid/numpy,pbrod/numpy,skwbc/numpy,bertrand-l/numpy,argriffing/numpy,nguyentu1602/numpy,ekalosak/numpy,MichaelAquilina/numpy,WillieMaddox/numpy,kiwifb/numpy,leifdenby/numpy,sonnyhu/numpy,behzadnouri/numpy,ssanderson/numpy,Eric89GXL/numpy,rherault-insa/numpy,groutr/numpy,jorisvandenbossche/numpy,AustereCuriosity/numpy,GaZ3ll3/numpy,ddasilva/numpy,Yusa95/numpy,jschueller/numpy,gfyoung/numpy,b-carter/numpy,mwiebe/numpy,tynn/numpy,jakirkham/numpy,MSeifert04/numpy,pyparallel/numpy,pbrod/numpy,groutr/numpy,nguyentu1602/numpy,jorisvandenbossche/numpy,moreati/numpy,madphysicist/numpy,grlee77/numpy,mingwpy/numpy,GaZ3ll3/numpy,bertrand-l/numpy,SunghanKim/numpy,jschueller/numpy,njase/numpy,dimasad/numpy,trankmichael/numpy,Yusa95/numpy,ekalosak/numpy,rhythmsosad/numpy,felipebetancur/numpy,mwiebe/numpy,rajathkumarmp/numpy,moreati/numpy,ahaldane/numpy,ESSS/numpy,cjermain/numpy,mathdd/numpy,mattip/numpy,numpy/numpy,MSeifert04/numpy,shoyer/numpy,chatcannon/numpy,Srisai85/numpy,bmorris3/numpy,ViralLeadership/numpy,pyparallel/numpy,Srisai85/numpy,simongibbons/numpy,solarjoe/numpy,trankmichael/numpy,dimasad/numpy,rudimeier/numpy,endolith/numpy,simongibbons/numpy,Eric89GXL/numpy,musically-ut/numpy,ekalosak/numpy,jankoslavic/numpy,Dapid/numpy,ChanderG/numpy,Srisai85/numpy,MaPePeR/numpy,SiccarPoint/numpy,grlee77/numpy,jakirkham/numpy,Anwesh43/numpy,Eric89GXL/numpy,tynn/numpy,hainm/numpy,felipebetancur/numpy,ChanderG/numpy,skwbc/numpy,madphysicist/numpy,mingwpy/numpy,mhvk/numpy,Yusa95/numpy,shoyer/numpy,jakirkham/numpy,trankmichael/numpy,utke1/numpy,sinhrks/numpy,nguyentu1602/numpy,cjermain/numpy,pdebuyl/numpy,pbrod/numpy,dwillmer/numpy,joferkington/numpy,ahaldane/numpy,GrimDerp/numpy,rhythmsosad/numpy,MaPePeR/numpy,sinhrks/numpy,MichaelAquilina/numpy,has2k1/numpy,githubmlai/numpy,cjermain/numpy,hainm/numpy,joferkington/numpy,gmcastil/numpy,ESSS/numpy,BabeNovelty/numpy,numpy/numpy,ddasilva/numpy,abalkin/numpy,KaelChen/numpy,musically-ut/numpy,abalkin/numpy,rudimeier/numpy,bertrand-l/numpy,jonathanunderwood/numpy,simongibbons/numpy,Anwesh43/numpy,rherault-insa/numpy,BabeNovelty/numpy,cjermain/numpy,KaelChen/numpy,mathdd/numpy,bmorris3/numpy,ViralLeadership/numpy,joferkington/numpy,rajathkumarmp/numpy,trankmichael/numpy,AustereCuriosity/numpy,WillieMaddox/numpy,CMartelLML/numpy,groutr/numpy,shoyer/numpy,ddasilva/numpy,Anwesh43/numpy,jakirkham/numpy,jonathanunderwood/numpy,dwillmer/numpy,KaelChen/numpy,stuarteberg/numpy,dimasad/numpy,argriffing/numpy,chiffa/numpy,sinhrks/numpy,jschueller/numpy,madphysicist/numpy,dwillmer/numpy,musically-ut/numpy,SiccarPoint/numpy,mhvk/numpy,gmcastil/numpy,kirillzhuravlev/numpy,hainm/numpy,ahaldane/numpy,kirillzhuravlev/numpy,pizzathief/numpy,MaPePeR/numpy,kiwifb/numpy,endolith/numpy,drasmuss/numpy,skymanaditya1/numpy,GrimDerp/numpy,numpy/numpy,ChristopherHogan/numpy,ekalosak/numpy,chiffa/numpy,felipebetancur/numpy,MichaelAquilina/numpy,mattip/numpy,chiffa/numpy,sonnyhu/numpy,gmcastil/numpy,mattip/numpy,charris/numpy,WarrenWeckesser/numpy,moreati/numpy,numpy/numpy,rgommers/numpy,WarrenWeckesser/numpy,BabeNovelty/numpy,grlee77/numpy,behzadnouri/numpy,mathdd/numpy,pdebuyl/numpy,SiccarPoint/numpy,tacaswell/numpy,felipebetancur/numpy,charris/numpy,has2k1/numpy,pdebuyl/numpy,leifdenby/numpy,bringingheavendown/numpy,has2k1/numpy,WarrenWeckesser/numpy,ssanderson/numpy,SunghanKim/numpy,jakirkham/numpy,charris/numpy,SunghanKim/numpy,BabeNovelty/numpy,seberg/numpy,skymanaditya1/numpy,ChristopherHogan/numpy,grlee77/numpy,sinhrks/numpy,tacaswell/numpy,ContinuumIO/numpy,rajathkumarmp/numpy,anntzer/numpy,utke1/numpy,stuarteberg/numpy,bmorris3/numpy,hainm/numpy,MaPePeR/numpy,b-carter/numpy,pbrod/numpy,MSeifert04/numpy,AustereCuriosity/numpy,ContinuumIO/numpy,rgommers/numpy,simongibbons/numpy,shoyer/numpy,behzadnouri/numpy,rhythmsosad/numpy,skymanaditya1/numpy,charris/numpy,CMartelLML/numpy,nbeaver/numpy,CMartelLML/numpy,drasmuss/numpy,utke1/numpy,bmorris3/numpy,ChristopherHogan/numpy,anntzer/numpy,jorisvandenbossche/numpy,nbeaver/numpy,mingwpy/numpy,Dapid/numpy,jonathanunderwood/numpy,skymanaditya1/numpy,pizzathief/numpy,KaelChen/numpy,GaZ3ll3/numpy,endolith/numpy,rgommers/numpy,kirillzhuravlev/numpy,maniteja123/numpy,mhvk/numpy,argriffing/numpy,kirillzhuravlev/numpy,dwillmer/numpy,tacaswell/numpy,pyparallel/numpy,Srisai85/numpy,skwbc/numpy,rudimeier/numpy,endolith/numpy,MSeifert04/numpy,seberg/numpy,njase/numpy,WarrenWeckesser/numpy,Yusa95/numpy,gfyoung/numpy,SiccarPoint/numpy,rhythmsosad/numpy,stuarteberg/numpy,has2k1/numpy,solarjoe/numpy,shoyer/numpy,joferkington/numpy,jankoslavic/numpy,pizzathief/numpy,SunghanKim/numpy,sonnyhu/numpy,mhvk/numpy,rudimeier/numpy,pizzathief/numpy,b-carter/numpy,githubmlai/numpy,GaZ3ll3/numpy,nbeaver/numpy,maniteja123/numpy,maniteja123/numpy,GrimDerp/numpy,mattip/numpy,ChanderG/numpy,ViralLeadership/numpy,mingwpy/numpy,leifdenby/numpy,madphysicist/numpy,pizzathief/numpy,rgommers/numpy,seberg/numpy,grlee77/numpy,Eric89GXL/numpy,rherault-insa/numpy,njase/numpy,Anwesh43/numpy,githubmlai/numpy,anntzer/numpy,MichaelAquilina/numpy,sonnyhu/numpy,abalkin/numpy,mwiebe/numpy,musically-ut/numpy,nguyentu1602/numpy,solarjoe/numpy,ChristopherHogan/numpy,ChanderG/numpy,CMartelLML/numpy,simongibbons/numpy,seberg/numpy,stuarteberg/numpy,kiwifb/numpy,githubmlai/numpy,ContinuumIO/numpy,WillieMaddox/numpy,bringingheavendown/numpy,dimasad/numpy,anntzer/numpy,chatcannon/numpy,MSeifert04/numpy,ESSS/numpy,pdebuyl/numpy,gfyoung/numpy,ahaldane/numpy,jorisvandenbossche/numpy,bringingheavendown/numpy,ssanderson/numpy,chatcannon/numpy,mhvk/numpy,tynn/numpy,jankoslavic/numpy,madphysicist/numpy,GrimDerp/numpy,pbrod/numpy,jschueller/numpy,drasmuss/numpy,jankoslavic/numpy,ahaldane/numpy,rajathkumarmp/numpy,jorisvandenbossche/numpy,WarrenWeckesser/numpy