actionbar support

In Android, the "header" idiomatic UI is an actionbar with an options items menu [as per](https://developer.android.com/guide/topics/ui/menus.html#options-menu)

I think this also needs an issue in https://github.com/Jasonette/documentation as currently the json spec only supports iOS style single action "menu icon" on right-hand side of the "header".

The existing code already uses a support lib toolbar and does `setSupportActionBar(toolbar)` so its about half way there already.

Start by reviewing the existing support library toolbar and the setSupportActionBar(toolbar) usage, then compare the requested behavior with Android's options-menu documentation. Check the related JSON specification work in Jasonette/documentation; done means the spec and Android implementation support an actionbar options-items menu rather than only a single right-side menu icon.

Written by the indexing model from the issue text.