Added all_schemes property to vcs support and make use of it.
Added all_schemes property to vcs support and make use of it.

caosmo/pip,esc/pip,supriyantomaftuh/pip,mindw/pip,mujiansu/pip,supriyantomaftuh/pip,James-Firth/pip,haridsv/pip,Carreau/pip,caosmo/pip,Ivoz/pip,jmagnusson/pip,xavfernandez/pip,zorosteven/pip,pypa/pip,msabramo/pip,msabramo/pip,h4ck3rm1k3/pip,mattrobenolt/pip,patricklaw/pip,squidsoup/pip,benesch/pip,harrisonfeng/pip,ChristopherHogan/pip,jmagnusson/pip,mattrobenolt/pip,rbtcollins/pip,zvezdan/pip,qbdsoft/pip,cjerdonek/pip,KarelJakubec/pip,KarelJakubec/pip,jamezpolley/pip,tdsmith/pip,techtonik/pip,qbdsoft/pip,ncoghlan/pip,RonnyPfannschmidt/pip,rouge8/pip,habnabit/pip,zorosteven/pip,qbdsoft/pip,rouge8/pip,pypa/pip,jythontools/pip,jasonkying/pip,habnabit/pip,qwcode/pip,fiber-space/pip,dstufft/pip,prasaianooz/pip,atdaemon/pip,jasonkying/pip,minrk/pip,blarghmatey/pip,mujiansu/pip,atdaemon/pip,pfmoore/pip,nthall/pip,graingert/pip,graingert/pip,rbtcollins/pip,pjdelport/pip,squidsoup/pip,alquerci/pip,xavfernandez/pip,pradyunsg/pip,yati-sagade/pip,erikrose/pip,esc/pip,alex/pip,yati-sagade/pip,pjdelport/pip,jythontools/pip,natefoo/pip,RonnyPfannschmidt/pip,qwcode/pip,ncoghlan/pip,ChristopherHogan/pip,natefoo/pip,willingc/pip,chaoallsome/pip,esc/pip,zvezdan/pip,haridsv/pip,erikrose/pip,benesch/pip,habnabit/pip,supriyantomaftuh/pip,sigmavirus24/pip,pjdelport/pip,pradyunsg/pip,Ivoz/pip,davidovich/pip,wkeyword/pip,dstufft/pip,fiber-space/pip,squidsoup/pip,alex/pip,techtonik/pip,jmagnusson/pip,minrk/pip,zvezdan/pip,alquerci/pip,Gabriel439/pip,haridsv/pip,h4ck3rm1k3/pip,sbidoul/pip,luzfcb/pip,fiber-space/pip,harrisonfeng/pip,luzfcb/pip,radiosilence/pip,wkeyword/pip,natefoo/pip,mindw/pip,zenlambda/pip,erikrose/pip,mindw/pip,sbidoul/pip,patricklaw/pip,sigmavirus24/pip,zenlambda/pip,techtonik/pip,ianw/pip,mujiansu/pip,zorosteven/pip,prasaianooz/pip,zenlambda/pip,willingc/pip,Gabriel439/pip,jamezpolley/pip,atdaemon/pip,dstufft/pip,davidovich/pip,alex/pip,rbtcollins/pip,willingc/pip,prasaianooz/pip,cjerdonek/pip,graingert/pip,ncoghlan/pip,yati-sagade/pip,jythontools/pip,blarghmatey/pip,benesch/pip,domenkozar/pip,KarelJakubec/pip,pfmoore/pip,James-Firth/pip,ChristopherHogan/pip,tdsmith/pip,sigmavirus24/pip,xavfernandez/pip,nthall/pip,caosmo/pip,davidovich/pip,nthall/pip,h4ck3rm1k3/pip,chaoallsome/pip,jamezpolley/pip,ianw/pip,tdsmith/pip,Carreau/pip,chaoallsome/pip,luzfcb/pip,Gabriel439/pip,James-Firth/pip,wkeyword/pip,RonnyPfannschmidt/pip,blarghmatey/pip,harrisonfeng/pip,jasonkying/pip,rouge8/pip