Versioned commands consistent with python.
Versioned commands consistent with python.

Fixes #1050

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