separate game logic from bot interface,

introduce exceptions instead of boolean returns,
remove repetitive code,
begin unit tests,
improve docstrings,
update to python-telegram-bot==4.1.1,
add ponyorm settings classes (unused)

game.py

@@ -48,6 +48,7 @@ class Game(object):
 
     @property
     def players(self):
+        """Returns a list of all players in this game"""
         players = list()
         if not self.current_player:
             return players
@@ -61,18 +62,23 @@ class Game(object):
         return players
 
     def reverse(self):
-        """ Reverse the direction of play """
+        """Reverses the direction of game"""
         self.reversed = not self.reversed
 
     def turn(self):
-        """ Mark the turn as over and change the current player """
+        """Marks the turn as over and change the current player"""
         self.logger.debug("Next Player")
         self.current_player = self.current_player.next
         self.current_player.drew = False
         self.current_player.turn_started = datetime.now()
+        self.choosing_color = False
 
     def play_card(self, card):
-        """ Play a card and trigger its effects """
+        """
+        Plays a card and triggers its effects.
+        Should be called only from Player.play or on game start to play the
+        first card
+        """
         self.deck.dismiss(self.last_card)
         self.last_card = card
 
@@ -100,7 +106,6 @@ class Game(object):
             self.choosing_color = True
 
     def choose_color(self, color):
-        """ Carries out the color choosing and turns the game """
+        """Carries out the color choosing and turns the game"""
         self.last_card.color = color
         self.turn()
-        self.choosing_color = False