mods to install mathjax from an explicitly downloaded tar or zip file
a few fixes

- default back tom Mathjax2.0
- install to profile by default
- fix in doc
- fix bad return
update 1.1 to 2.0
make destination configurable
Fixed infinite loop on exit in the event of where multiple debuggers have been attached an there is an uncaught exception. I am in the process of submitting a similar patch for ipdb.
Maintain backwards compatibility in BdbQuit_excepthook.excepthook_ori.
use argparse to make most of the parameters configurable
Update IPython/core/debugger.py

Correctly print stack traces when context is larger than lines of source.
Minor bugfix: user_ns is not an attribute of Magic objects.
Merge pull request #2713 from corranwebster/docs-magic-reference-bugfix

Doc bugfix: user_ns is not an attribute of Magic objects.
remove unexisting headings level
Add test for gh-2697
Merge pull request #2717 from bfroehle/ipdb_short_function

One liner to fix debugger printing stack traces when lines of context are larger than source.
Merge pull request #2716 from Carreau/too-many-headings

remove unexisting headings level
fix testing all subpath where to install mathjax
Merge pull request #2446 from Carreau/offline_mathjax

Refactor mathjax install

alternativ to PR 2267.

Install mathjax in .profile/static with a few option to install from already downloaded tarballs or select other install path.
Add qthelp docs creation.
try to fix rtfd
Merge pull request #2729 from Carreau/rtfd

Fix Read the doc build, Again
added blockquote CSS