Re-introduce 2.6 in build matrix, using distribution-supplied python version rather than building from scratch.  Use deadsnakes repository for python 2.6
Re-introduce 2.6 in build matrix, using distribution-supplied python version rather than building from scratch.  Use deadsnakes repository for python 2.6

runt18/nupic,jcasner/nupic,elkingtonmcb/nupic,cogmission/nupic,virneo/nupic,cngo-github/nupic,arhik/nupic,metaml/nupic,breznak/nupic,blueburningcoder/nupic,jcasner/nupic,virneo/nupic,elkingtonmcb/nupic,BeiLuoShiMen/nupic,jcasner/nupic,alfonsokim/nupic,sambitgaan/nupic,passiweinberger/nupic,SaganBolliger/nupic,pulinagrawal/nupic,sambitgaan/nupic,allanino/nupic,cogmission/nupic,pap/nupic,loretoparisi/nupic,rcrowder/nupic,marionleborgne/nupic,SaganBolliger/nupic,rcrowder/nupic,rayNymous/nupic,rhyolight/nupic,fergalbyrne/nupic,mcanthony/nupic,brev/nupic,rhyolight/nupic,brev/nupic,darshanthaker/nupic,pulinagrawal/nupic,mcanthony/nupic,akhilaananthram/nupic,arhik/nupic,numenta-ci/nupic,vitaly-krugl/nupic,subutai/nupic,BeiLuoShiMen/nupic,akhilaananthram/nupic,BoltzmannBrain/nupic,pap/nupic,ywcui1990/nupic,rcrowder/nupic,eranchetz/nupic,elkingtonmcb/nupic,wanghaven/nupic,neuroidss/nupic,go-bears/nupic,ywcui1990/nupic,chanceraine/nupic,darshanthaker/nupic,lscheinkman/nupic,rayNymous/nupic,allanino/nupic,lscheinkman/nupic,numenta/nupic,go-bears/nupic,chen0031/nupic,eranchetz/nupic,loretoparisi/nupic,glorizen/nupic,blueburningcoder/nupic,numenta-ci/nupic,darshanthaker/nupic,glorizen/nupic,metaml/nupic,arhik/nupic,akhilaananthram/nupic,pap/nupic,rayNymous/nupic,fergalbyrne/nupic,runt18/nupic,ben-hopps/nupic,GeraldLoeffler/nupic,chanceraine/nupic,scottpurdy/nupic,numenta/nupic,badlogicmanpreet/nupic,alfonsokim/nupic,vamsirajendra/nupic,fergalbyrne/nupic,GeraldLoeffler/nupic,runt18/nupic,BoltzmannBrain/nupic,chen0031/nupic,virneo/nupic,EricSB/nupic,vitaly-krugl/nupic,blueburningcoder/nupic,pulinagrawal/nupic,subutai/nupic,sambitgaan/nupic,numenta-ci/nupic,SaganBolliger/nupic,markneville/nupic,BeiLuoShiMen/nupic,badlogicmanpreet/nupic,EricSB/nupic,EricSB/nupic,ywcui1990/nupic,neuroidss/nupic,ben-hopps/nupic,marionleborgne/nupic,cngo-github/nupic,loretoparisi/nupic,vamsirajendra/nupic,markneville/nupic,scottpurdy/nupic,scottpurdy/nupic,wanghaven/nupic,passiweinberger/nupic,neuroidss/nupic,markneville/nupic,vitaly-krugl/nupic,numenta/nupic,alfonsokim/nupic,glorizen/nupic,BoltzmannBrain/nupic,cngo-github/nupic,ben-hopps/nupic,cogmission/nupic,go-bears/nupic,breznak/nupic,marionleborgne/nupic,rhyolight/nupic,chanceraine/nupic,chen0031/nupic,metaml/nupic,subutai/nupic,mcanthony/nupic,breznak/nupic,eranchetz/nupic,badlogicmanpreet/nupic,passiweinberger/nupic,brev/nupic,GeraldLoeffler/nupic,vamsirajendra/nupic,allanino/nupic,wanghaven/nupic,lscheinkman/nupic