title: Unity Prime31 prompt for photo is crashing on iOS 10 and XCode 8
body: <p>Calling EtceteraBinding.promptForPhoto resulting in immediate crash on iOS 10.</p>
  
  <pre><code>public void TakePhotoTapped() {
  
      #if UNITY_IOS
      EtceteraBinding.promptForPhoto(0.2f, PhotoPromptType.Camera, 0.8f, true);
      #endif
  
  }
  </code></pre>
  
  <p>Xcode spits out this log. It does look like some sort of permission issue? Please help.</p>
  
  <pre><code>2016-10-11 11:46:35.758167 xxx[1643:458841] invalid mode 'kCFRunLoopCommonModes' provided to CFRunLoopRunSpecific - break on _CFRunLoopError_RunCalledWithInvalidMode to debug. This message will only appear once per execution.
  2016-10-11 11:46:49.760643 xxx[1643:458841] [MC] System group container for systemgroup.com.apple.configurationprofiles path is /private/var/containers/Shared/SystemGroup/systemgroup.com.apple.configurationprofiles
  2016-10-11 11:46:49.768609 xxx[1643:458841] [MC] Reading from public effective user settings.
  2016-10-11 11:47:02.450381 xxx[1643:459135] [access] This app has crashed because it attempted to access privacy-sensitive data without a usage description.  The app's Info.plist must contain an NSCameraUsageDescription key with a string value explaining to the user how the app uses this data.
  </code></pre>