Added .toString() method to Group proto
Added .toString() method to SoundJSDirector proto.
Build changes and bump version to 0.2.3
Added custom 'stopped' event sending in group.stop() method.
Support custom 'stopped' event hadling for fix stopped files replaing.
Build changes and bump version to 0.2.4
Added .load() method to SoundJSDirector.prototype for preload all added sounds.
Improved .stop() method of SoundJSGroup.prototype (now can stop only isntance(s)/src(s)/id(s)).
Chagned SoundJSDirector.protoype cached variable to SoundJSDirectorProto.
Added 'SoundJSDirectorProto' to global variables list in .jshintrc.
Build changes (new .load() and improved .stop() methods) and bump version to 0.3.0