[Provider] Change provider construction (possible BC break)

* Created AbstractProvider class (for all DB services), which handles the default batch_size option.
 * The logger Closure is now optional for populate().
 * Removed unused Elastica_Type argument from Provider constructors.
 * Added unit tests for Doctrine's AbstractProvider class.
 * The extra argument (ManagerRegistry) for Doctrine providers is now an appended constructor argument, so the extension no longer needs to use different replacement indexes for Propel/Doctrine providers.

Provider/AbstractProvider.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace FOQ\ElasticaBundle\Provider;
+
+use FOQ\ElasticaBundle\Persister\ObjectPersisterInterface;
+use FOQ\ElasticaBundle\Provider\ProviderInterface;
+
+abstract class AbstractProvider implements ProviderInterface
+{
+    protected $objectClass;
+    protected $objectPersister;
+    protected $options;
+
+    /**
+     * Constructor.
+     *
+     * @param ObjectPersisterInterface $objectPersister
+     * @param string                   $objectClass
+     * @param array                    $options
+     */
+    public function __construct(ObjectPersisterInterface $objectPersister, $objectClass, array $options = array())
+    {
+        $this->objectPersister = $objectPersister;
+        $this->objectClass = $objectClass;
+
+        $this->options = array_merge(array(
+            'batch_size' => 100,
+        ), $options);
+    }
+}