Figure out multi valued fields

When there're more than two values, it starts nesting the results.

The provided patch fixes it, by creating a plain array as in:

+++ b/efq_extra_field.module
@@ -86,23 +86,31 @@ class EntityFieldQueryExtraFields extends EntityFieldQuery {
+              $value = $previous_entity->extraFields->{$id};
+              $value[] = $entity->extraFields->{$id};
+              $entity->extraFields->{$id} = $value;

Reworked this lines.

Looks good to me

Works great! Thanks!