Allow rendered links to define an id

This was specifically added for interop with a plugin that was
anticipating a selector as a constructor option (Help Overlay).
Add pageguide plugin

A configurable help overlay system with custom style overlays
added separately.
Add a custom help tour

This custom tour highlights major components of the app and
makes use of configurable colors from region.json
Merge pull request #170 from mmcfarland/topic/help-overlay

Help overlay