Adding DebugKit toolbar plugin to base CakePHP install.

The latest version of DebugKit can be found at: https://github.com/cakephp/debug_kit
Adding in hooks to activate DebugKit plugin.

Commented out the default cakePHP sql viewer as it is now handled by DebugKit.
Merge pull request #10 from timcrider/master

Added DebugKit CakePHP debugger