Function to get collaborative tags and user id of owner of the file

[kselltrum]

It would be great to have the capability to get collaborative tags from selected file and user id of owner of the file (from get_input_files() in node object )

[Raudius]

Hey, thanks for the suggestions :)

They have now been addressed in:

• add get_tags function #33
• Add owner_id to file meta_data #44