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.
Here is a nice fix, if you change this to:

    FauxtonAPI.Events.on('QueryOptions:openTray', this.toggleQueryOptionsTray, this);

Then you don't need the anonymous function to set the context. Same for the event on line 74. See the [backbone docs](http://backbonejs.org/#Events-on) for the `[context]` optional parameter.