class Sprockets::Manifest

'digest' => "2e8e9a7c6b0aafa0c9bdeec90ea30213" } }
'mtime' => "2011-12-13T21:47:08-06:00",
{ 'logical_path' => "application.js",
{ "application-2e8e9a7c6b0aafa0c9bdeec90ea30213.js" =>

digest: Base64 hex digest (String)
mtime: ISO8601 mtime (String)
logical_path: Logical path (String)
Fingerprint path (String):

which map to an attributes array.
Returns internal file directory listing. Keys are filenames

def files
  @data['files'] ||= {}
end