Merge pull request #1015 from azie-ginanjar/make_message_optional

make message parameter on intent handler optional

====  Tech Notes ====
intent handlers that don't use the message bus message no longer need to have the argument so a simple intent handler could be

    def handle_yahoo(self):
        self.speak('Yahoo')

mycroft/skills/core.py

@@ -36,6 +36,8 @@ from mycroft.messagebus.message import Message
 from mycroft.util.log import getLogger
 from mycroft.skills.settings import SkillSettings
 
+from inspect import getargspec
+
 __author__ = 'seanfitz'
 
 skills_config = ConfigurationManager.instance().get("skills")
@@ -323,9 +325,19 @@ class MycroftSkill(object):
             try:
                 if need_self:
                     # When registring from decorator self is required
+                    if len(getargspec(handler).args) == 2:
                         handler(self, message)
+                    elif len(getargspec(handler).args) == 1:
+                        handler(self)
                     else:
+                        raise TypeError
+                else:
+                    if len(getargspec(handler).args) == 2:
                         handler(message)
+                    elif len(getargspec(handler).args) == 1:
+                        handler()
+                    else:
+                        raise TypeError
                 self.settings.store()  # Store settings if they've changed
             except:
                 # TODO: Localize