Use region provided by zamboni in index.html if present (bug 1082855)

If the user is logged out this avoids the call to consumer_info
entirely for the iframed app / website. It does nothing for the
true packaged app, since it has its own static index.html.
Merge pull request #772 from diox/use-region-in-body-if-present

Use region provided by zamboni in index.html if present (bug 1082855)