Clean up ant build files and Eclipse dev classpath.

Public reviews at:
http://gwt-code-reviews.appspot.com/1524804/
http://gwt-code-reviews.appspot.com/1523807/

Patch by: stephen.haberman
Review by: jat,rdayal


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10763 8db76d5a-ed1c-0410-87a9-c151d255dfc7