Naan Studio has released a major update to its popular Twitter client, Echofon adding native iPad support to the free version as well as several other new features for both the free and paid versions. Echofon 4.0 is now a universal application supporting the iPhone, iPod touch and iPad; previously only Echofon Pro offered native iPad support. Version 4.0 on the iPad also introduces support for Twitter’s real-time user streams providing instantaneous…