Refactor the plugin loading system to accept full module paths

This allows a person to load plugins into charlesbot, that are outside
the charlesbot namespace.

.coveragerc

@@ -7,3 +7,4 @@ exclude_lines =
     if __name__ == .__main__.:
     pass
     rtm_send_message
+    def main(args=None):

charlesbot/robot.py

@@ -1,11 +1,11 @@
-from charlesbot.util.plugins import initialize_plugins
 from slackclient import SlackClient
 import logging
 import asyncio
 import sys
 import signal
 import traceback
 import functools
+import importlib
 from charlesbot.config import configuration
 
 
@@ -43,7 +43,6 @@ def route_message_to_plugin(self):
         yield from asyncio.sleep(0.5)
 
     def get_message_type(self, msg):
-        import importlib
         obj_list = [
             "charlesbot.slack.slack_channel_joined.SlackChannelJoined",
             "charlesbot.slack.slack_channel_left.SlackChannelLeft",
@@ -60,6 +59,17 @@ def get_message_type(self, msg):
                 return_obj.load(msg)
                 return return_obj
 
+    def initialize_plugins(self):
+        return_list = []
+        if not self.enabled_plugins:
+            return return_list
+        for x in self.enabled_plugins:
+            module_name, class_name = x.rsplit(".", 1)
+            obj_class = getattr(importlib.import_module(module_name), class_name)  # NOQA
+            return_obj = obj_class(self.sc)
+            return_list.append(return_obj)
+        return return_list
+
     @asyncio.coroutine
     def queue_message(self, message, plugin):
         if message:
@@ -86,7 +96,7 @@ def start(self):
             self.log.error("Error conecting to Slack - possible token issue?")
             sys.exit(1)
         loop = asyncio.get_event_loop()
-        self.plugin_list = initialize_plugins(self.sc, self.enabled_plugins)
+        self.plugin_list = self.initialize_plugins()
         loop.create_task(self.produce())
         loop.add_signal_handler(
             signal.SIGINT,

config.yaml.example

@@ -1,8 +1,10 @@
 main:
   slackbot_token: 'xoxb-...'
   enabled_plugins:
-    - 'BroadcastMessage'
-    - 'Help'
+    - 'charlesbot.plugins.broadcast_message.BroadcastMessage'
+    - 'charlesbot.plugins.help_plugin.Help'
+    - 'charlesbot.plugins.pagerduty.pagerduty.Pagerduty'
+    - 'charlesbot.plugins.jira.jira.Jira'
 
 pagerduty:
   token: 'E7px6VVr3PVHZPJq51oa'