A small round of doc and error message fixes. 
- JsValueGlue.java and ModuleSpace.java now report message more clearly when there is a mismatch between the declared return type and the actual JS result type.
- Added the new DOM client package to the javadoc build, including a new package.html file.
- Removed the comment in JavaScriptObject.java saying that JSO can't be subclassed.

Patch by: bruce
Review by: rdayal (desk check)

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@2415 8db76d5a-ed1c-0410-87a9-c151d255dfc7
6 files changed