Support usage of module shortcuts.

I had a problem using amd-optimize because I was using some shortcuts to access to some module in my code.
In the config file I got some declaration like this :
```javascript
{
  paths : {
    "core" : "path/to/lib/core"
  }
}
```
So when I want to access to ```path/to/lib/core/MyModule.js``` I just need to use it like this:
```javascript
define("core/MyModule", function(myModule){
});
```
This is working with requireJS without optimization, but it was not working with amd-optimize.
I'm not sure it is a good way to use requireJS (even if it works). It is the first time I write code with coffee script. So, please, review my code before merging it.