* Removed all __future__ imports from code
* Removed all six dependencies
* Removed all future_builtins imports
* Removed all Python 2 related code
Closes: deluge-torrent/deluge#325
- Use sphinxcontrib.spelling with custom wordlist.
- Skip the checking of the modules documents as they raise
false-positives.
- Add a setup.py spellcheck_docs command.
- Fix spelling and other issues.
- Add a doc favicon.