W3lib

----------------

- support non-standard gb_2312_80 encoding;
- drop Python 2.5 support.

----------------

- Detect encoding for content attr before http-equiv in meta tag.

----------------

- w3lib.html.remove_comments handles multiline comments;
- Added w3lib.encoding module, containing functions for working with character
encoding, like encoding autodetection from HTML pages.
- w3lib.url.urljoin_rfc is deprecated.

----------------

First release of w3lib.