Geode UVs

Hello !

Finally, back to Jax !

This PR adds homotilic UV mapping as default for the geodes duals ; see example in the controller `geodes`.

Don't mind the two commits about `application.rb`, this is me struggling with `rake`, and discovering a new fullscreen jax server !

---

Actually, I cannot find a way to slay the errors I get without this file. I installed `libqt4-dev`, `qt4-qmake` and Pygments, which made some disappear.

I'm running a fresh Debian wheezy install, with RVM and :

```
$ ruby -v
ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-linux]

$ rails -v
Rails 3.2.13

$ bundle -v
Bundler version 1.3.5
```
and I still get :

```
$ rake server --trace
** Invoke server (first_time)
** Execute server
rake aborted!
cannot load such file -- jax/rails/application
/home/tonio/Code/FORKS/jax/tasks/development/server.rake:4:in `require'
/home/tonio/Code/FORKS/jax/tasks/development/server.rake:4:in `block in <top (required)>'
/usr/local/rvm/gems/ruby-2.0.0-p247@jax/gems/rake-10.0.3/lib/rake/task.rb:228:in `call'
[...]
```

Bundle update is all green and shiny. I'm puzzled...