Reset impressionTrackersFiredForCurrentContentView before each load.   (May be too simplistic.)
Reset impressionTrackersFiredForCurrentContentView before each load.
  (May be too simplistic.)

appnexus/mobile-sdk-ios,appnexus/mobile-sdk-ios,appnexus/mobile-sdk-ios,appnexus/mobile-sdk-ios,appnexus/mobile-sdk-ios,appnexus/mobile-sdk-ios