Added a downloads dir to keep track of the jquery stuff.
Improved CDN check for themes.
Only using the minified and complete CSS for each theme.
Add the 1.10.1 files back in, will not remove these from repo in future, use the gemspec to not add them.
For testing jQuery UI 1.10.1.
Remove fallback routes, can't be tested the way they were set up so I just disconnect from the network instead.
Downgraded the version to fix it.
Major changes:

* I test fallback by disconnecting from the network, no need for those routes in the examples.
* CDN availability is checked by a HEAD request to the CDN.
* Several themes can be chosen.
* The mixture of class methods and instance wasn't working so now pass the Rack env hash to self.cdn. Much better. Means that organisation is now an option.
* Media Temple is now the default CDN because Google and Microsoft have proven themselves to be on the side of evil with all this PRISM nonsense.
* Paths to files are generated at instantiation time. It makes sense now several themes can be chosen, it's a lot easier to check, and it's probably faster (checked that by holding my finger to the breeze).
* Specs updated.
* Bits of docs updated.
Updated README to match changes.
Only pick up the current version's jquery files when building the gem. Means I can stop this nonsense with adding/removing it at each version.