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

Fix setup.py for Python 2.7

Fixed

• Encoding error in setup.py when running Python 2.7

Other

• Added badges to README and other document changes
• Adopt tox for package install testing

Use shared version

Fixed

• Use shared VERSION file.

Bug Fix Patch

Fixed

• Add missing dependency
• Removed unknown version

Add support for more sort options

Features:

• Add support for the updated_at, first_seen_at, and tag_count sort options.

Add support for wilson and width sorts

Features:

• Add support for the wilson and width sorting options.

Based on joshua-stone/DerPyBooru at 0.7.3