ENH: Expose Euler-Mascheroni constant.
ENH: Expose Euler-Mascheroni constant.

This closes issue gh-2753.

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