Added LangExtensionStateListener and LangAuthorListener
Finished implementing xml:lang>lang listener
Minor additions to LangAuthorListener
First go at custom attr val edt and starting an attr edt dialog
Finished implementing AttributeEditorDialog
Linked XHTMLAttributeValueEditor up with the new AttributeEditorDialog
Implemented allowMultipleValues and allowEdit
Fixed bug in startup position of attributes dialog
A bit of using org
Deleted attributeValueLists.xml - exists in branch gh-pages
Merge pull request #45 from Notalib/nota-845

Nota 845
Merge branch 'master' of https://github.com/Notalib/nota.oxygen
solved issue and added new schemas