Compiler should be eventful!

* Implemented Zend\\EventManager\\EventManager
* Updated scripts to utilize ServiceManager

A quick example of how you might write an initializer:
```php
class Module
{
    public function getServiceConfig()
    {   
        return array(
            'initializers' => array(
                'ContainEntityCompiler' => function ($service, $sm) {
                    if ($service instanceof \Contain\Entity\Compiler\Compiler) {
                        $service->getEventManager()->attach('definition.set', function ($e) {
                            $definition = $e->getParam('definition');
                            if ($definition instanceof Entity\Definition\MyDefinition) {
                                $definition->setProperty(
                                    'extended',
                                    'boolean'
                                );  
                            }   
                        }); 
                    }   
                }   
            ), 
        );  
    }   
}
```