added ability for multiple instances of elfinder with different configurations
added ability for multiple instances of elfinder with different configurations

dipens/FMElfinderBundle,helios-ag/FMElfinderBundle,skylord123/FMElfinderBundle,skylord123/FMElfinderBundle,helios-ag/FMElfinderBundle,eliotik/FMElfinderBundle,eliotik/FMElfinderBundle,dipens/FMElfinderBundle