allow python 2.7 in Travis CI
allow python 2.7 in Travis CI

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