Log Message:
py-bleach: update to 2.1.1

Version 2.1.1:
**Bug fixes**
* Fix ``setup.py`` opening files when ``LANG=``.

Version 2.1:
**Security fixes**
* Convert control characters (backspace particularly) to "?" preventing
  malicious copy-and-paste situations.
  See `<https://github.com/mozilla/bleach/issues/298>`_ for more details.
  This affects all previous versions of Bleach. Check the comments on that
  issue for ways to alleviate the issue if you can't upgrade to Bleach 2.1.

**Backwards incompatible changes**
* Redid versioning. ``bleach.VERSION`` is no longer available. Use the string
  version at ``bleach.__version__`` and parse it with
  ``pkg_resources.parse_version``.
* clean, linkify: linkify and clean should only accept text types
* clean, linkify: accept only unicode or utf-8-encoded str

**Bug fixes**
* ``bleach.clean()`` no longer unescapes entities including ones that are missing
  a ``;`` at the end which can happen in urls and other places.
* linkify: fix http links inside of mailto links
* clarify security policy in docs
* fix dependency specification for html5lib 1.0b8, 1.0b9, and 1.0b10
* add Bleach vs. html5lib comparison to README
* fix KeyError exceptions on tags without href attr
* add test website and scripts to test ``bleach.clean()`` output in browser