Phase 1 of readying samples for distro; do not produce Elipse stuff.

Still TODO:
- Produce a top-level ant file for the distro/samples.
- Add dependency on gwt-dev to Showcase (or all samples)?

Review by: amitmanjhi

git-svn-id: https://google-web-toolkit.googlecode.com/svn/releases/1.6@4570 8db76d5a-ed1c-0410-87a9-c151d255dfc7