Add unicode utils plugin

Also remove example one

unicode.plug

+[Core]
+module = unicode
+name = Unicode
+
+[Documentation]
+description = Details about unicode characters
+
+[Python]
+version = 3

unicode.py

+from errbot import BotPlugin, botcmd
+
+
+class Unicode(BotPlugin):
+    """Details about unicode characters"""
+
+    @botcmd
+    def ord(self, message, args):
+        """Runs ord() on the characters given"""
+        return [ord(c) for c in args]
+
+    @botcmd
+    def chr(self, message, args):
+        """Runs chr() on the numbers given"""
+        try:
+            return ''.join([chr(int(i)) for i in args.split()])
+        except ValueError as e:
+            return "Error: {}".format(e)