Work-around for pseudo-josticks by @Algorithmus #5

A bug in PyGame causes some non-joysticks to appear as joysticks: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=710162

@Algorithmus proposed a work-around for that in #5: Ignoring self-acclaimed joysticks with too few axes.

src/controller.py

@@ -61,7 +61,7 @@ def notify(self, event):
                         self.event_manager.post(attack_request_ev)
 
                 #Handle events generated by game pad
-                if self.joystick:
+                if self.joystick and self.joystick.get_numaxes() > 3:
                     '''
                     XBox game pad 2. axis: X 3, Y 4
                     Sony game pad 2. axis: X 3, Y 2
@@ -83,4 +83,4 @@ def notify(self, event):
                         if self.joystick.get_button(7):
                             attack_request_ev = events.MouseButtonDown()
                             self.event_manager.post(attack_request_ev)
-
+