AWS SDK for Android 2.13.4

Bug Fixes

• AWS Mobile Client
  • Fix initialization NPE for Hosted UI feature. See issue #888

Enhancements

• AWS Mobile Client
  • Update logic to expose network related exceptions during API calls. The network related exceptions were not surfaced previously in API calls like getUserAttributes. Only the exceptions that conclusively indicate signed-out are used to trigger SIGNED_OUT_TOKENS_INVALID variants. See issue #679
  • Reduced logging of unfound dependencies for the Hosted UI feature when not used.
  • Delay usage of drop-in UI dependencies until showSignIn() is called.

Misc. Updates

• Model updates for the following services :
  • Amazon Lambda