Sanitize the output and text cells of published worksheets.
Add nofollow to html scrubbing.  Thanks to Volker Braun for bringing it up.
Don't scrub html twice.
Remove the remainder of the whatwg unsafe tags.

See https://groups.google.com/forum/?fromgroups=#!msg/sage-devel/ze5PZc1Wyjk/sjc-vkYbkUIJ for a discussion.
Make license GPLv3+ to be compatible with Apache-2 of MathJax
slight doc improvement

This example confused someone at [Trac 13621](http://trac.sagemath.org/sage_trac/ticket/13621).
Merge pull request #166 from kcrisman/patch-3

slight doc improvement
Relax interact check for cells to allow passing options
upgrade MathJax to version 2.2
Do not stop worksheets on Sign Out
Set default timeout to 0 as documented and make it configurable
Support '....:' doctest syntax in livedocs
Don't strip leading whitespace from doctests
Merge pull request #171 from novoselt/no-default-timeouting

Set default timeout to 0 as documented and make it configurable
Merge pull request #170 from novoselt/do-not-stop-worksheets

Do not stop worksheets on Sign Out
Merge pull request #167 from jhpalmieri/mathjax2.2

upgrade MathJax to version 2.2
Merge pull request #162 from ppurka/license

Make license GPLv3+ to be compatible with Apache-2 of MathJax
Update the changelog
Merge pull request #168 from novoselt/fix-interact-with-layout

Relax interact check for cells to allow passing options
fix timeout issues in worksheet