Revert "Rewrite clean function since it was misbehaving and deleting files in an ignored directory."
Revert "Rewrite clean function since it was misbehaving and deleting files in an ignored directory."

This reverts commit c0d24ecc32c9f2a7ee852288454020ee3b88b037.

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