1.0.0
  * implemented directory zip download

  * single html file page for Filer

  * Filer allows uploads

  * tree_patterner function to ease creation of website tree

  * changed name and signature of BaseProvider.get_content() to handle_get
  
  * a provider can now define handlers of any http method (POST, PUT, ...etc) by
    defining handle_<method name> method in the subclass
  
  * a provider can now define a default request handler method named
    handle_default() to be called if no handler for the request method is
    defined
  
  * handler now will parse body if `content-type` header is
    `multipart/form-data` and pass the data as dictionary to the provider
    to the provider

