reword comment to be more clear
actions: added icon class to allow custom icons

not restricted to glyphicons now
actions: move Endpoint class from nav to action, use for actions
actions: store compiled template_string
add singleton module with UniqueName base class
action: documentation for getset decorator
action: 'active' renamed 'enabled'.
action: add 'status', for ui action status (enabled, disabled, active)
nav: g.nav['active'] should be set to navitem path of active navitem.

navgroups are active if one of their navitem is active