- changes the MANIFEST.MF file and allows usage of package o.e.j.widgets
- removes "Experimental" paragraph from javadoc
- added @since to all

Change-Id: I9f648866a0d87a26bfe82c3e5c9fdf69f54215dc
Signed-off-by: Marcus Hoepfner <marcus.hoepfner@sap.com>