added mathRenderer
auto add mathML ns on item creation
added new shared libs : util/html/math/xml
Reorganized metadata implementation + metadatainjection beginning for IMS Manifest Files
missing code in addMapping() method.
wrong doc.
wrong implementation in addMapping()
forward model events from document to widget.$ontainer
added listener trigger on removeAttr
listening to inner element change
Merge pull request #21 from oat-sa/math-renderer

Math renderer
unit test for antoine's task!
Better unit testing for ImsManifest Injection.
Implement injector interface to put metadata values into ims manifest
<metadata/> no more existing in input file
insert <metadata> before file
insert value in the leaf
remove logger
some problem with load/unload of DOMDocument using namespaces, the usual headache...
change exception message
works with or without <mteadata/>