Merge pull request #157 from ppurka/changelog

Update changelog
Version bump to 0.10.6
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
upgrade MathJax to version 2.2
Do not stop worksheets on Sign Out
Set default timeout to 0 as documented and make it configurable
Merge pull request #171 from novoselt/no-default-timeouting

Set default timeout to 0 as documented and make it configurable