Helpful additions

1. Added a check to ensure `/build/uploader/assets/flashuploader.swf` exists in both the CDN and CDN-SSL builds.  If it is not found, you will get the following error during the `release-validate` task:

        Fatal error: Failed to find: release/3.10.1pre/cdn/build/uploader/assets/flashuploader.swf

2. Added a check to ensure `dist/build/io-xdr/io.swf` exists during a release build.

3. Extraneous whitespace cleanup, thanks to my editor.