allow for override of publicURL in rackspace provider to InternalURL
allow for override of publicURL in rackspace provider to InternalURL

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