Handle signalOperationExecuted in OdtDocument
and if it is an operation that was an 'edit',
handle the updating of dc:creator, dc:date,
and meta:editing-cycles.
* Add webodfversion.js.in (thanks Friedrich!)
to track the webodf version in js.
* OdfContainer gets updateMetadataForSaving,
which is called just before saving
and updates dc:generator.
Added OT for UpdateMetadata.

Add capabilities to OperationTests.js
and to TransformationTests.js,
test for <office:meta> elements.

Add corresponding tests for
OpUpdateMetadata.