Fix compiling of CoffeeScript files

CoffeeScript files compiling to **separated** files. And scripts **from subdirectories** compiling too.

Additional information can be found in issue #81

P.S.: to run coffeescript tests, you need add 
```javascript
    '.tmp/scripts/**/*.js',
    '.tmp/spec/**/*.js'
```
to `files` variable in `testacular.conf.js` (I don't know where this file generated)