Major cleanups in Dialogs for mgwt 2.0.

Fixes #38
Trick eclipse to not show compile errors.
Merge pull request #64 from dankurka/cleanup_dialogs

Major cleanups in Dialogs for mgwt 2.0.
Add hide / show to OverlayMenu
Merge pull request #65 from dankurka/workaround_broken_eclipse_parser

Trick eclipse to not show compile errors.
Addressed feedback
Merge pull request #66 from dankurka/add_hide_show-nav

Add hide / show to OverlayMenu