Add support for unnamed intents

This allows skill writers to ignore naming intents.  Combined with a
forthcoming change to Adapt that creates a default of None for IntentBuilder()

This allows the current:
    @intent_handler(IntentBuilder("CurrentWeatherIntent").require(
        "Weather").optionally("Location").build())
    def handle_current_weather(self, message):
        ...

To become:
    @intent_handler(IntentBuilder().require("Weather").optionally("Location"))
    def handle_current_weather(self, message):
        ...

Which will automatically name the Intent "handle_current_weather".

Also dropped the log message in the default initialize() method since it is
common to not override it now.

mycroft/skills/core.py

@@ -295,11 +295,11 @@ class MycroftSkill(object):
 
     def initialize(self):
         """
-        Initialization function to be implemented by all Skills.
+        Initialization function, run after fully constructed
 
         Usually used to create intents rules and register them.
         """
-        LOG.debug("No initialize function implemented")
+        pass
 
     def get_intro_message(self):
         """
@@ -459,6 +459,10 @@ class MycroftSkill(object):
         elif type(intent_parser) != Intent:
             raise ValueError('intent_parser is not an Intent')
 
+        if not intent_parser.name:
+            # Default to the handler's function name if None or ""
+            intent_parser.name = handler.__name__
+
         name = intent_parser.name
         intent_parser.name = str(self.skill_id) + ':' + intent_parser.name
         self.emitter.emit(Message("register_intent", intent_parser.__dict__))