Replace usage of feedparser for sanitizing html with new HtmlSanitizer module.
HtmlSanitizer prevents from XSS attacks (Fixes issue 606).
Coverage: code coverage testing for Python
Coverage.py is a Python module that measures code coverage during test execution.
It uses the code analysis tools and tracing hooks provided in the Python standard
library to determine which lines are executable, and which have been executed.
For more information, see http://nedbatchelder.com/code/modules/coverage.html