XML-RPC Extended Media Upload

This plugin extends the default XML-RPC server API with one new method for specifying author and parent post of remotely uploaded attachment files.

1. preserved backward compatibility with the basic method wp.uploadFile
2. simple usage, just replace with wp_extended.uploadFile and add 2 OPTIONAL parameters to the data struct: author (string, user_id of author) and parent (string, post_id of parent post)
3. without the optional parameters the new method is identical in behaviour with the basic method found in WordPress API of XML-RPC