Added Mathjax support for math.stackexchange.com.

Equations and expressions are only rendered in question view at the moment.

python/media/js/mathjax/README.md

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+# MathJax
+
+## Beautiful math in all browsers
+
+MathJax is an open-source JavaScript display engine for LaTeX, MathML, and
+AsciiMath notation that works in all modern browsers.  It was designed with
+the goal of consolidating the recent advances in web technologies into a
+single, definitive, math-on-the-web platform supporting the major browsers
+and operating systems.  It requires no setup on the part of the user (no
+plugins to download or software to install), so the page author can write
+web documents that include mathematics and be confident that users will be
+able to view it naturally and easily.  Simply include MathJax and some
+mathematics in a web page, and MathJax does the rest.
+
+Some of the main features of MathJax include:
+
+- High-quality display of LaTeX, MathML, and AsciiMath notation in HTML pages
+
+- Supported in most browsers with no plug-ins, extra fonts, or special
+  setup for the reader
+
+- Easy for authors, flexible for publishers, extensible for developers
+
+- Supports math accessibility, cut-and-paste interoperability, and other
+  advanced functionality
+
+- Powerful API for integration with other web applications
+
+See <http://www.mathjax.org/> for additional details.
+
+
+## Installation and Usage
+
+The MathJax installation and usage documentation is available in the
+`docs/html` directory of the MathJax distribution (see
+`docs/html/index.html` for the starting point).  The documents are also
+available on the MathJax web site on line at <http://www.mathjax.org/resources/docs/>.
+
+
+## Community
+
+The main MathJax website is <http://www.mathjax.org>, and it includes
+announcements and other important information.  MathJax is maintained and
+distributed on GitHub at <http://github.com/mathjax/MathJax>.  A user forum
+for asking questions and getting assistance is hosted at Google, and the
+bug tracker is hosted at GitHub:
+
+Bug tracker:         <https://github.com/mathjax/MathJax/issues>  
+MathJax-Users Group: <http://groups.google.com/group/mathjax-users>
+
+Before reporting a bug, please check that it has not already been reported.
+Also, please use the bug tracker for reporting bugs rather than the help forum.