Fix unicode error in py2.7 for example plugin

Strings should now be passed to the plugins as unicode values in py2.7
so we have to make sure that we don't convert those into ascii by using
python str instead of u'' strings.

rtmbot/core.py

@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+from __future__ import unicode_literals
 import sys
 import glob
 import os
@@ -101,8 +102,7 @@ class RtmBot(object):
                     if limiter:
                         time.sleep(.1)
                         limiter = False
-                    message = output[1]
-                    channel.send_message("{}".format(message))
+                    channel.send_message(output[1])
                     limiter = True
 
     def crons(self):