Update filesystem provider
Update filesystem provider

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