add intermediary tests for finder priorities
add intermediary tests for finder priorities

- test finder._find_all_versions results
- replace dead test with gmpy and dead c.pypi.python.org mirror
  by pip on pypi/warehouse

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