1. Added proxy support for Reporting API changes: https://msdn.microsoft.com/en-us/library/bing-ads-overview-release-notes.aspx#reporting_v9_may2016
2. Added support for new Bulk entity type ‘App Install Ad’.
3. Support to specify a state request parameter in OAuthAuthorization subclasses to help prevent cross site request forgery. Be sure to verify that the authorization server returns the same value before proceeding to use any values from the response.
4. Support to reuse existing OAuthToken info by passing “OAuthTokens” parameter into the constructor of OAuthAuthorization subclasses.