ipython/ipython — pull request #1710 by minrk (2012-05-07 20:31:47+00:00)
Title: update MathJax CDN url for https

As [discussed on mathjax-users](https://groups.google.com/forum/?fromgroups#!topic/mathjax-users/DTKMWwVe7Yo), the MathJax CDN is moving. This doesn't affect mathjax from http, which just uses cdn.mathjax.org, but for SSL-certiificates the actual CDN url must be used (formerly cloudfront, now rackcdn).

I also decided to forego my `gethostbyname_ex` hack, which would allow the same code to continue to work if the url changed while on the same CDN, which officially shouldn't happen. That was me solving a theoretical problem that could not officially happen.

0.12-series is unaffected, as the https-cdn hack was not backported to 0.12.1.