Replace Rhino 1.7R2 with RhinoCoffeeScript, which includes Rhino 1.7R4

https://github.com/ngocdaothanh/RhinoCoffeeScript

The current CoffeeScript compiler in Scalate is very slow. It takes several seconds to compile a simple CoffeeScript snippet. RhinoCoffeeScript solves the problem by using the precompiled CoffeeScript.class.

Hope a new version of Scalate will be released soon.