CoffeeScript filter custom config

Added loading custom config to the CoffeeScript parser, to use it via package configuration. Example:

```php
...
'filters' => array(
		'.coffee' => array(
			new Codesleeve\AssetPipeline\Filters\CoffeeScript(array('bare' => true)),
			new EnvironmentFilter(new Codesleeve\AssetPipeline\Filters\JSMinPlusFilter, App::environment()),
		)
...
```