TravisCI integration and updated test suite (#296)

* Make TravisCI setup

* Use pytest, move tests to seperate files

* Added system to check if `onX` events were successfully executed

tests/test_message_management.py

@@ -0,0 +1,12 @@
+# -*- coding: utf-8 -*-
+
+from __future__ import unicode_literals
+
+import pytest
+
+from fbchat.models import Message, MessageReaction
+
+
+def test_set_reaction(client):
+    mid = client.send(Message(text="This message will be reacted to"))
+    client.reactToMessage(mid, MessageReaction.LOVE)