Adding image_json for access to underlying JSON

Added

• Image class now has an image_json property to get to the underlying JSON
  field (image still returns representations["full"] but will change to
  the JSON value in a future version).

Fixed

• Updated Search methods to use q= params:
  • faves uses my:faves
  • upvotes uses my:upvotes
  • uploads uses my:uploads
  • watched uses my:watched