Move MarkupTagCleaner to separated sanitizer module
Fix bug that clean_html() ignores entity chars
HTML sanitizer  #6
Text.sanitized_html property.  Close #6
Test PyPy first

PyPy is the slowest, so make it to start first
Fix bug that standalone attrs breaks sanitize_html.

Fix #6
Revise rfc822 decode method

Now decoding a rfc822 string with minus timezone string or
heading and trailing white spaces works.
Merge branch 'master' of https://github.com/earthreader/libearth into crawler
Merge pull request #15 from viobo/crawler

Revise rfc822 decode method
codec error when leading/trailing strings.
remove all `display` on style attribute.
Merge branch 'master' of https://github.com/earthreader/libearth into crawler
Summary was not put
Decoding rfc3339 str with heading or following whitespaces
Remake autodiscovery module
Make FeedLink class
Add tests for autodiscovery
Autodiscovery return a list of a FeedLink when get feed xml
Use namedtuple instead of class FeedLink
Edit autodiscovery docstring