added animation to the Back button
added animation to the Back button

bengottlieb/ios,5calls/ios,bengottlieb/ios,tomburns/ios,5calls/ios,bengottlieb/ios,5calls/ios,tomburns/ios,nikrad/ios,5calls/ios,nikrad/ios,tomburns/ios,tomburns/ios,bengottlieb/ios,nikrad/ios,nikrad/ios