Add October 3 changes #429

Add changes as of October 3, 2016.
Mostly games: https://core.telegram.org/bots/api#games

• Games
• getWebhookInfo and WebhookInfo
• Allow HTTP url in all methods that accept InputFile or file_id (this requires disabling our own handling of this)
• Url parameter in answerCallbackQuery
• switch_inline_query_current_chat
• Add caption fields to send_audio, send_voice, InlineQueryResultAudio, InlineQueryResultVoice, ``InlineQueryResultCachedAudioandInlineQueryResultCachedVoice`
• all_members_are_admins in Chat
• Handle the errors of ResponseParameters