Deprecate w3lib.form.encode_multipart. Fix GH-14.
Remove w3lib.form from README; add a warning to encode_multipart docstring.

Deprecation warnings are silenced by default in Python 2.7, so it is better to add a warning to the docstring as well.
Bump version to 1.4
toxify travis-ci builds and drop py2.6
Bumped version to 1.5
stdeb isn not picking requried six version from setup.py
Initial sphinxdoc setup
Modifications to w3lib.encoding module
Merge pull request #17 from kmike/deprecate-w3lib-form

[MRG] Deprecate w3lib.form.encode_multipart. Fix GH-14.
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
Fix doctests + add doctests to tox config (only Py2.x)
Merge pull request #20 from redapple/sphinxdocstrings

Fix doctests + add doctests to tox config
Restore distutils compatibility.
more straightforward distutils fallback