New Query Options tray added

For scope, see: https://issues.apache.org/jira/browse/COUCHDB-2347

Two important things to mention:
1. The "Compact View" button has been removed. I want to discuss with @seanbarclay about whether it should really appear in the tray.
2. There's an outstanding issue (outside this ticket) where the header bar doesn't always show the correct content when navigating from page to page.
Oops, I'll remove it! Old code. [the preview / updateView stuff wasn't done in the original Bocoup code, btw - just stubbed out]. It's be added at a later date but not with this commit. 

Well spotted! :)