Just one day after providing a major update for its Android Gmail app, Google (GOOG) has delivered a much-needed revamp to its iOS Gmail app, providing several key features such as support for multiple accounts and autocomplete functionality. Other key features to the new Gmail app include an infinitely scrolling inbox, the ability to respond to Google Calendar invites inline, and greater integration with the Google+ social network. Gmail 2.0 for iOS is now free to download from the Apple (AAPL) App Store and has been updated for both the iPhone and iPad.