Log Message:
Update to 0.11
Add LICENSE

Upstream changes:
0.11      2013-10-11 15:11:59 Europe/London

0.10      2013-09-27 15:05:03 Europe/London
    - RT3008 Changed examples to be XSS free
    - RT19063, RT25477 fixed handling of self closing tags,
      for example '<hr />'
    - * attribute rule can be a regexp
    - callbacks in rules to check or adjust attributes with
      custom code (RT15747)