Loadpath setter

[mkraemer]

Hi,

i would like to use symfonys di-container to define the paths used for loading includes in assetics compassFilter.
The filter already provides the setLoadPaths() method to do that (kriswallsmith/assetic#251), so the only thing needed is an addition to the container definition of the filter.

Exemplary use in symfonys config.yml:

assetic:
    debug:          %kernel.debug%
    use_controller: false
    bundles:
        - eFormFrontendBundle
    #java: /usr/bin/java
    filters:
        compass: 
            debug:  false
            bin: %compass_bin%
            load_paths: %additional_compass_paths%

Thanks