Fixes Issue #1204.
Adds javadoc to ImageBundle to inform developers about:
- potential security risks associated with generating bundles on certain
versions of the JVM
- setting the appropriate cache headers when protecting image bundle files
with web application security constraints.

Also, this cleans up the section on "Image Bundles and the HTTPS Protocol",
and modifies the ImageBundle documentation in the developer guide to reflect
the updated information in the ImageBundle javadocs.

Found by: rustyshelf
Patch by: rdayal
Review by: knorton



git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@1278 8db76d5a-ed1c-0410-87a9-c151d255dfc7
2 files changed