Add three new methods to ITransformationProvider: void AddIndex(string name, string table, params string[] columns); bool IndexExists(string table, string name); void RemoveIndex(string table, string name);

Implement in providers, added two test cases. I dont have access to Oracle so have implemented its provider based on what I found on the web.

Is there any reason that this hasn't been included in Migratordotnet? This patch was sent in a year ago.