build: update configure (unix) to accpept python 2.7 too
build: update configure (unix) to accpept python 2.7 too

both python version 2.6, 2.7 are supported, there's little difference:
http://docs.python.org/dev/whatsnew/2.7.html#porting-to-python-2-7

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