Implement revalidate_path for figshare
Implement revalidate_path for figshare

  * path formats can be:
    - <article_id>
    - <article_id>/<file_id>

  if a article only contains a single file then
  it's file and article_id are refered to as a single file
  but they are still 2 separate entities to figshare

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