Make r_ and c_ instances of subclasses of concatenator, with appropiate docstrings.
Make r_ and c_ instances of subclasses of concatenator, with appropiate docstrings.

mortada/numpy,astrofrog/numpy,ChanderG/numpy,rajathkumarmp/numpy,githubmlai/numpy,ChristopherHogan/numpy,numpy/numpy-refactor,nguyentu1602/numpy,gmcastil/numpy,andsor/numpy,pyparallel/numpy,joferkington/numpy,has2k1/numpy,ChanderG/numpy,matthew-brett/numpy,ssanderson/numpy,pizzathief/numpy,ewmoore/numpy,WillieMaddox/numpy,kiwifb/numpy,joferkington/numpy,GaZ3ll3/numpy,jorisvandenbossche/numpy,pelson/numpy,tdsmith/numpy,MaPePeR/numpy,BabeNovelty/numpy,abalkin/numpy,ewmoore/numpy,immerrr/numpy,gfyoung/numpy,mwiebe/numpy,ContinuumIO/numpy,Dapid/numpy,bmorris3/numpy,matthew-brett/numpy,dimasad/numpy,dwf/numpy,ContinuumIO/numpy,behzadnouri/numpy,behzadnouri/numpy,BMJHayward/numpy,SunghanKim/numpy,dimasad/numpy,numpy/numpy-refactor,Anwesh43/numpy,ahaldane/numpy,dato-code/numpy,ahaldane/numpy,bmorris3/numpy,ChristopherHogan/numpy,cowlicks/numpy,pelson/numpy,mingwpy/numpy,Yusa95/numpy,maniteja123/numpy,drasmuss/numpy,ajdawson/numpy,pdebuyl/numpy,rhythmsosad/numpy,bmorris3/numpy,numpy/numpy,dimasad/numpy,jorisvandenbossche/numpy,mingwpy/numpy,SiccarPoint/numpy,rherault-insa/numpy,dwillmer/numpy,pizzathief/numpy,jankoslavic/numpy,Dapid/numpy,seberg/numpy,Anwesh43/numpy,AustereCuriosity/numpy,WarrenWeckesser/numpy,jakirkham/numpy,hainm/numpy,ChristopherHogan/numpy,pdebuyl/numpy,MaPePeR/numpy,mathdd/numpy,musically-ut/numpy,immerrr/numpy,rmcgibbo/numpy,BabeNovelty/numpy,dch312/numpy,GaZ3ll3/numpy,grlee77/numpy,cjermain/numpy,simongibbons/numpy,Srisai85/numpy,CMartelLML/numpy,jankoslavic/numpy,seberg/numpy,rmcgibbo/numpy,drasmuss/numpy,mhvk/numpy,kirillzhuravlev/numpy,brandon-rhodes/numpy,dato-code/numpy,bertrand-l/numpy,jakirkham/numpy,Linkid/numpy,larsmans/numpy,rudimeier/numpy,MichaelAquilina/numpy,rherault-insa/numpy,larsmans/numpy,BMJHayward/numpy,ahaldane/numpy,WarrenWeckesser/numpy,GrimDerp/numpy,tdsmith/numpy,rajathkumarmp/numpy,has2k1/numpy,hainm/numpy,chiffa/numpy,empeeu/numpy,ViralLeadership/numpy,ogrisel/numpy,MSeifert04/numpy,madphysicist/numpy,ogrisel/numpy,GrimDerp/numpy,ESSS/numpy,ddasilva/numpy,jorisvandenbossche/numpy,mindw/numpy,Yusa95/numpy,Yusa95/numpy,numpy/numpy-refactor,gmcastil/numpy,dato-code/numpy,rajathkumarmp/numpy,numpy/numpy,githubmlai/numpy,argriffing/numpy,embray/numpy,bmorris3/numpy,bertrand-l/numpy,sigma-random/numpy,anntzer/numpy,tdsmith/numpy,tynn/numpy,sonnyhu/numpy,argriffing/numpy,sinhrks/numpy,dwf/numpy,astrofrog/numpy,stuarteberg/numpy,AustereCuriosity/numpy,mortada/numpy,jonathanunderwood/numpy,shoyer/numpy,cowlicks/numpy,cjermain/numpy,ogrisel/numpy,sinhrks/numpy,immerrr/numpy,ViralLeadership/numpy,trankmichael/numpy,jankoslavic/numpy,MaPePeR/numpy,Srisai85/numpy,ewmoore/numpy,moreati/numpy,WarrenWeckesser/numpy,grlee77/numpy,felipebetancur/numpy,jonathanunderwood/numpy,endolith/numpy,bertrand-l/numpy,pelson/numpy,ekalosak/numpy,rmcgibbo/numpy,andsor/numpy,brandon-rhodes/numpy,gmcastil/numpy,mhvk/numpy,rgommers/numpy,groutr/numpy,njase/numpy,MaPePeR/numpy,Linkid/numpy,rudimeier/numpy,pelson/numpy,pbrod/numpy,jschueller/numpy,KaelChen/numpy,stefanv/numpy,Eric89GXL/numpy,solarjoe/numpy,seberg/numpy,mwiebe/numpy,groutr/numpy,argriffing/numpy,kiwifb/numpy,AustereCuriosity/numpy,SunghanKim/numpy,chiffa/numpy,WillieMaddox/numpy,mindw/numpy,tacaswell/numpy,stefanv/numpy,MSeifert04/numpy,embray/numpy,b-carter/numpy,BMJHayward/numpy,ChanderG/numpy,GaZ3ll3/numpy,pbrod/numpy,yiakwy/numpy,nguyentu1602/numpy,skymanaditya1/numpy,shoyer/numpy,stuarteberg/numpy,KaelChen/numpy,mattip/numpy,mathdd/numpy,ewmoore/numpy,dwillmer/numpy,githubmlai/numpy,charris/numpy,rajathkumarmp/numpy,MichaelAquilina/numpy,mhvk/numpy,stefanv/numpy,felipebetancur/numpy,brandon-rhodes/numpy,endolith/numpy,rherault-insa/numpy,pbrod/numpy,SiccarPoint/numpy,yiakwy/numpy,leifdenby/numpy,utke1/numpy,larsmans/numpy,utke1/numpy,shoyer/numpy,ahaldane/numpy,chatcannon/numpy,sonnyhu/numpy,Yusa95/numpy,solarjoe/numpy,charris/numpy,groutr/numpy,empeeu/numpy,felipebetancur/numpy,nbeaver/numpy,larsmans/numpy,rhythmsosad/numpy,has2k1/numpy,kirillzhuravlev/numpy,astrofrog/numpy,leifdenby/numpy,mattip/numpy,mathdd/numpy,MichaelAquilina/numpy,NextThought/pypy-numpy,skwbc/numpy,mattip/numpy,trankmichael/numpy,ewmoore/numpy,skymanaditya1/numpy,Srisai85/numpy,simongibbons/numpy,madphysicist/numpy,mingwpy/numpy,grlee77/numpy,NextThought/pypy-numpy,mingwpy/numpy,naritta/numpy,nbeaver/numpy,sonnyhu/numpy,rhythmsosad/numpy,charris/numpy,rgommers/numpy,ChristopherHogan/numpy,musically-ut/numpy,nbeaver/numpy,felipebetancur/numpy,matthew-brett/numpy,madphysicist/numpy,dch312/numpy,tacaswell/numpy,cjermain/numpy,joferkington/numpy,mindw/numpy,ajdawson/numpy,ajdawson/numpy,tacaswell/numpy,pizzathief/numpy,MSeifert04/numpy,shoyer/numpy,astrofrog/numpy,matthew-brett/numpy,sonnyhu/numpy,ESSS/numpy,madphysicist/numpy,naritta/numpy,nguyentu1602/numpy,rudimeier/numpy,gfyoung/numpy,dwf/numpy,behzadnouri/numpy,matthew-brett/numpy,kirillzhuravlev/numpy,numpy/numpy-refactor,b-carter/numpy,embray/numpy,hainm/numpy,BabeNovelty/numpy,moreati/numpy,WarrenWeckesser/numpy,simongibbons/numpy,mortada/numpy,skymanaditya1/numpy,njase/numpy,jakirkham/numpy,NextThought/pypy-numpy,mortada/numpy,tynn/numpy,stuarteberg/numpy,anntzer/numpy,andsor/numpy,ogrisel/numpy,pizzathief/numpy,githubmlai/numpy,kiwifb/numpy,Eric89GXL/numpy,ajdawson/numpy,cjermain/numpy,ChanderG/numpy,abalkin/numpy,stefanv/numpy,Eric89GXL/numpy,Anwesh43/numpy,sinhrks/numpy,immerrr/numpy,endolith/numpy,chatcannon/numpy,yiakwy/numpy,skymanaditya1/numpy,simongibbons/numpy,SiccarPoint/numpy,sinhrks/numpy,mindw/numpy,empeeu/numpy,rhythmsosad/numpy,pelson/numpy,drasmuss/numpy,NextThought/pypy-numpy,joferkington/numpy,sigma-random/numpy,jschueller/numpy,pbrod/numpy,dato-code/numpy,GrimDerp/numpy,anntzer/numpy,skwbc/numpy,pdebuyl/numpy,musically-ut/numpy,astrofrog/numpy,abalkin/numpy,sigma-random/numpy,BMJHayward/numpy,hainm/numpy,pyparallel/numpy,Srisai85/numpy,mhvk/numpy,tynn/numpy,numpy/numpy-refactor,kirillzhuravlev/numpy,dwillmer/numpy,GrimDerp/numpy,Linkid/numpy,ddasilva/numpy,CMartelLML/numpy,jankoslavic/numpy,seberg/numpy,SunghanKim/numpy,sigma-random/numpy,ekalosak/numpy,simongibbons/numpy,has2k1/numpy,jorisvandenbossche/numpy,maniteja123/numpy,utke1/numpy,KaelChen/numpy,endolith/numpy,Anwesh43/numpy,ogrisel/numpy,jorisvandenbossche/numpy,jschueller/numpy,Linkid/numpy,jakirkham/numpy,maniteja123/numpy,trankmichael/numpy,musically-ut/numpy,stefanv/numpy,pyparallel/numpy,numpy/numpy,dch312/numpy,Dapid/numpy,tdsmith/numpy,CMartelLML/numpy,pdebuyl/numpy,mattip/numpy,bringingheavendown/numpy,dwf/numpy,MSeifert04/numpy,embray/numpy,chatcannon/numpy,chiffa/numpy,dwillmer/numpy,stuarteberg/numpy,jakirkham/numpy,rudimeier/numpy,cowlicks/numpy,ContinuumIO/numpy,anntzer/numpy,skwbc/numpy,nguyentu1602/numpy,ViralLeadership/numpy,njase/numpy,trankmichael/numpy,mhvk/numpy,rmcgibbo/numpy,charris/numpy,dch312/numpy,brandon-rhodes/numpy,WillieMaddox/numpy,moreati/numpy,BabeNovelty/numpy,GaZ3ll3/numpy,jonathanunderwood/numpy,leifdenby/numpy,madphysicist/numpy,b-carter/numpy,grlee77/numpy,KaelChen/numpy,ssanderson/numpy,mathdd/numpy,MichaelAquilina/numpy,ekalosak/numpy,ekalosak/numpy,Eric89GXL/numpy,SunghanKim/numpy,WarrenWeckesser/numpy,rgommers/numpy,cowlicks/numpy,ahaldane/numpy,naritta/numpy,embray/numpy,dwf/numpy,SiccarPoint/numpy,ssanderson/numpy,gfyoung/numpy,shoyer/numpy,empeeu/numpy,naritta/numpy,grlee77/numpy,bringingheavendown/numpy,CMartelLML/numpy,solarjoe/numpy,bringingheavendown/numpy,andsor/numpy,pizzathief/numpy,rgommers/numpy,ddasilva/numpy,yiakwy/numpy,numpy/numpy,MSeifert04/numpy,jschueller/numpy,dimasad/numpy,ESSS/numpy,mwiebe/numpy,pbrod/numpy