Fixed @license ref in class docblock.

Signed-off-by: Tom Green <kingofcuddles@gmail.com>
TWeaked the key include slightly.. looks silly having key.key.php, but makes it easy to block via my global gitignore.

Signed-off-by: Tom Green <kingofcuddles@gmail.com>
Added ability to specify the API version via the __construct method.

Signed-off-by: Tom Green <kingofcuddles@gmail.com>