Xcode 5 iOS 7 Support
Cherry pick of 14407e1.

Author: Egor Leonenko <jagor@leonenko.info>
Date: 19 décembre 2013 23:36:16 UTC+1

Call avformat_network_init() for all
Update Project
Comment out a LumberJack logger specific function call.
Update Rakefile for iOS 7.1, arm64 and a better version of gas-preprocessor.