Fixed: link to buttons demo
Fixed: new Events namespace

The Events system is now located in the diva namespace.

Refs #144
New: Events system is namespaced to diva.Events

Diva's event system has been namespaced into diva.Events using a module pattern. The anonymous function is evaluated immediately as an expression, and returns the "pub" object (with nested Events object) into the global scope as properly namespaced public methods. The cache object remains private as in the original Events implementation.

Refs #144
Fixed: canvas plugin now uses namespaced Events system

Refs #144