更新了xcode 7，Admob的组件出问题了（解决办法）
出现这个错误：
GoogleMobileAds(GADGestureIdUtil.o)' does not contain bitcode. You must rebuild it with bitcode enabled (Xcode setting ENABLE_BITCODE), obtain an updated library from the vendor, or disable bitcode for this target. for architecture armv7
解决办法：
Target -> Build Settings -> Build Options -> Enable Bitcode 属性修改成NO
