New design!

* Refactored the JavaScript to be cleaner and more reusable.
* Implemented a simple design.
* Added dropdown arrow
* Changed ace theme (to be more rustic)
* Added Rust logo
Renamed
Refactored everything.

* Integrated the awesome error reporting that landed in rust-www.
* Cleaner Design.
* The extra options are hidden by default.
* New "More Options" button that toggles the extra options.
* Modified the button styles.
* New evaluate button!
Forgot to remove the extra js file
Updated to use the new separate_output option
Merge pull request #5 from thehydroimpulse/master

New design!