support folder deletion
support folder deletion

TomBaxter/waterbutler,chrisseto/waterbutler,cosenal/waterbutler,rafaeldelucena/waterbutler,felliott/waterbutler,icereval/waterbutler,Johnetordoff/waterbutler,RCOSDP/waterbutler,Ghalko/waterbutler,kwierman/waterbutler,rdhyee/waterbutler,CenterForOpenScience/waterbutler,hmoco/waterbutler