Update SQLServerPlatform.php by adding methods related to schema.

The platform indicates support for schema's here: https://github.com/doctrine/dbal/blob/master/lib/Doctrine/DBAL/Platforms/SQLServerPlatform.php#L129

But is missing relevant methods:
schemaNeedsCreation() --> to detect if schema creation is needed
and
getCreateSchemaSQL() --> to create a schema

lib/Doctrine/DBAL/Platforms/SQLServerPlatform.php

@@ -163,6 +163,22 @@ class SQLServerPlatform extends AbstractPlatform
         return false;
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    public function getCreateSchemaSQL($schemaName)
+    {
+        return 'CREATE SCHEMA ' . $schemaName;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function schemaNeedsCreation($schemaName)
+    {
+        return $schemaName !== 'dbo';
+    }
+
     /**
      * {@inheritDoc}
      */