plugins:Add plugin for saying no to 'sir'

we have added a plugin and related test
to prevent any contributor from saying sir.

Closes #337

plugins/no_sir.plug

@@ -0,0 +1,11 @@
+[Core]
+name = no_sir
+module = no_sir
+
+[Documentation]
+description = Tell people to not use 'sir' when they do.
+
+[Python]
+version = 3
+
+[Errbot]

plugins/no_sir.py

@@ -0,0 +1,18 @@
+import re
+
+from errbot import BotPlugin, re_botcmd
+
+
+class no_sir(BotPlugin):
+  """
+  Do not use sir
+  """
+  def callback_message(self, msg):
+    emots = [':D']
+    if match_sir:
+      self.send(
+        msg.frm,
+        '@{}, Do not use sir in your conversation. {}'.format(
+          msg.frm.nick, emots[0]
+				)
+			)

tests/no_sir_test.py

@@ -0,0 +1,11 @@
+import os
+import no_sir
+from errbot.backends.test import testbot
+
+
+class Test_no_sir(object):
+    extra_plugin_dir = '.'
+
+    def test_no_sir(self, testbot):
+        testbot.push_message('sir')
+        assert 'Do not use sir in your conversation' in testbot.pop_message()