Charade -> Chardet and Add cacert.pem license

- Charade is gone, long live Chardet.
- cacert.pem is now taken wholesale from Mozilla so we need to display that
  itis licensed under the MPL2.0
Remove unnecessary bits from cacert notice section
Merge pull request #1934 from kennethreitz/update-notice

Charade -> Chardet and Add cacert.pem license