Fix default suffix being 'src' (new value: '') fixes #28

Author: ek9

src/Extension.php

@@ -148,7 +148,7 @@ public function configure(ArrayNodeDefinition $builder)
                                            ->useAttributeAsKey('name')
                                            ->prototype('array')
                                                ->children()
-                                                   ->scalarNode('prefix')->defaultValue('src')->end()
+                                                   ->scalarNode('prefix')->defaultValue('')->end()
                                                    ->scalarNode('suffix')->defaultValue('.php')->end()
                                                ->end()
                                            ->end()