fixes #310 and allows for versions like -py3 instead of -py2.6 or -py3.0
fixes #310 and allows for versions like -py3 instead of -py2.6 or -py3.0

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