Release 2.1.

* Use updated rdf-reasoner with OGP literal datatype support. This addresses issue #19.
Add Cache-Control: no-cache when loading a page.
Remember validate_ssl flag when loading application.
Add reference to Release Notes and Issue Tracker to dropdown menu.
Make menu items stand out more.
Version 2.2.
Release 2.2

* Add Cache-Control: no-cache when loading a page.
* Remember validate_ssl flag when loading application.
* Add reference to Release Notes and Issue Tracker to dropdown menu.
* Make menu items stand out more.