Convert filters test to unittest format (mostly) and fix style issues.
Convert filters test to unittest format (mostly) and fix style issues.

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