Merge from vendor branch TNF:

Merge from vendor branch TNF:
Initial import of merb-has-flash-0.9.2 as www/merb-has-flash.

Merb_has_flash is a plugin for the Merb framework that provides Rails-style
flash.

The ``flash'' provides a way to pass temporary objects between actions.
Anything you place in the flash will be exposed to the very next action
and then cleared out.  This is a great way of doing notices and alerts,
such as a create action that sets

	flash[:notice] = "Successfully created"

before redirecting to a display action that can then expose the flash
to its template.