application lib loading before load_config, which rendered config.platform.lib config option useless

In https://github.com/adhearsion/adhearsion/blob/develop/lib/adhearsion/initializer.rb#L42
      
    def start
        resolve_pid_file_path
        load_lib_folder
        load_config
        ...

Also,  it might be good to have an option to not do the eager-loading on lib/**/*.rb