Merge pull request #71 from mprobst/master

Add support for a bunch more safe HTML element tags, and bring them into...
Add a test for the correct handling of escaped entities in HTML.

The sanitization code does not retain any particular escaped entities - it
parses the HTML and thus loses the information on what entities were in the
original. The result is correct UTF-8 HTML though.
Merge pull request #74 from mprobst/sanitize_test

Add a test for the correct handling of escaped entities in HTML.