Add property provider generators, take 2.

Patch by: jat
Review by: unnurg

Review at http://gwt-code-reviews.appspot.com/1063801


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9470 8db76d5a-ed1c-0410-87a9-c151d255dfc7
13 files changed