Convert sp overlap test to unittest format and fix style issues.
Convert sp overlap test to unittest format and fix style issues.

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