v1.3

• migrated bbot messages schema to msft botframework's schema. added msft cards like thumbnails card, video card, audio card and hero card. added suggestionActions with imBack support
• updated channels and extensions with new internal message schema
• added support for msft BotBuilder (Botframework library) bot engine using DirectLine protocol
• added Botframework channel. now any channel supported by it it's supported by bbot
• added support for Dialogflow rich responses platforms Google Assistant, Facebook, Slack, Telegram and Skype. Dialogflow bots now provides proper message response for each channel type thanks to new channel_id property. also two new properties defaultPlatform and forcePlatform are added to improve control on platform responses
• added Telegram support for button suggestions for any message type like images, video, sound
• template extension Templator now iterates through the whole object looking for {{}} tags. now any string in the bot response can use templates functions and custom ones like service functions
• added option to add to last message in core.add_output()
• added channel_id property for engines to return proper responses to each channel type
• improvements on restful channel