def file(name, version = @ref, try_on_disk = false)
      @file_class.new(self).find(name, version, try_on_disk)
    end
def file(name, version = @ref, try_on_disk = false)
      @file_class.new(self).find(name, version, try_on_disk)
    end
Public: Get the static file for a given name.

 name    - The full String pathname to the file.
 version - The String version ID to find (default: @ref).
 try_on_disk - If true, try to return just a reference to a file
               that exists on the disk.

 Returns a Gollum::File or nil if no matching file was found. Note
 that if you specify try_on_disk=true, you may or may not get a file
 for which on_disk? is actually true.