Initial sphinxdoc setup
Modifications to w3lib.encoding module
Modifications to w3lib.form and w3lib.http modules
Modifications to w3lib.url and w3lib.html modules
Merge remote-tracking branch 'origin/master' into sphinxdocstrings

Conflicts:
	w3lib/form.py
Merge pull request #19 from redapple/sphinxdocstrings

Add Sphinx doc configuration and Makefile and enhanced docstrings