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.
Fix doctests in comments2rst.py

Added optional tags and fixed a couple spacing/newline things.
Small "doctest" fix

worksheet2rst.py
fix doctests in sagenb/notebook/cell.py
fix doctests in sagenb/notebook/notebook.py
fix KeyError in user_manager.py
fix doctest in user_manager.py
fix doctests in sagenb/notebook/worksheet.py
Merge pull request #160 from kcrisman/sws2rst

Sws2rst updates - fix doctests.
add nodoctest.py to directories that should not be doctested
replace tmp_dir+'.sagenb' with tmp_dir(ext='.sagenb')
Merge pull request #161 from ppurka/doctests

Fix doctests in sagenb directory
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