* Fix Bug #571
ConversationHandler will not process CallbackQuery if per_chat=True and
the CallbackQuery has no message attached to it (as is the case with
buttons on inline results)
* Adds test case for CallbackQuery without Chat
* conversationhandler.py: add per_chat, per_user and per_message
* test_conversationhandler.py: test case per_user=False
* test_conversationhandler.py: add test for callbackqueryhandlers
* ✏️ Fix accidental typo in logging format
* Added methods to generate the original markdown/html formatted string from the entities contained in an update
* Added
* Moved the html/markdown parsing methods to `Message`
* Moved extract_* methods from helpers to the appropriate location
* Refactored text_markdown and text_html
* Refactored text_markdown and text_html for efficiency
* Fixed method call in conversationhandler
* Fixed method call in handler
* Fixed `make test` command on windows systems
* Improved method documentation
* initial commit for user_data
* add chat_data and use defaultdict
* fix chat_data copy-paste error
* add test for user_data and chat_data
* fix case where chat is None
* remove braces from import line
* initial commit for conversationhandler and example
* implement simple Promise for run_async/conversationhandler
* refactor Promise._done to done
* add handling for timed out Promises
* correctly handle promises with None results
* fix handling tuple states
* update comments on example
* Added a first test on the ConversationHandler.
* Fixed a small typo.
* Yapf'd.
* add sphinx doc for conversation handler
* fix title for callbackqueryhandler sphinx docs