getConnectionForComponent and bindComponent are case sensitive

When using multiple database connections, the sfDoctrinePlugin for Symfony 1.4.x is case sensitive when looking up the connection for a model / component while the Symfony is not.

This causes code to function correct even when the model names are used in lower case. Once a second connection is configured, the model name is registered in upper case via the base-class (as per the naming convention) causing the wrong connection to be chosen when the model is referenced in lower case.

This:

 
$componentName = 'Country';

$this->_bound[$componentName] = $connectionName;

Will result in no connection found for:

 
$componentName = 'country';

if (isset($this->_bound[$componentName])) {
            return $this->getConnection($this->_bound[$componentName]);
        }

Unless this was purposely designed to be case-sensitive, I think this should be changed to prevent confusion since in general PHP is not case sensitive when dealing with variable names.

This bug is related to http://www.doctrine-project.org/jira/browse/DC-740