Adds a return clause before where as per OrientDB's documentation (https://github.com/orientechnologies/orientdb/wiki/SQL-Update). The choice of "returning" was made to avoid conflict with the already existing "return".

Issue #134
Issue #134: introduced phpnode suggestions and changed returning method to return in order to make it clearer. It will only take effect for update, insert and delete queries.
Merge pull request #135 from dmarcelino/134-add-return-clause

#134: Adds a RETURN clause before WHERE