Fixes issue #978.
- Removes extra whitespace and parentheses around negative numbers
- Removes unnecessary semicolons after the last statement of a block

Suggested by: fredsa
Patch by: sgross
Review by: me


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@1805 8db76d5a-ed1c-0410-87a9-c151d255dfc7