Adding new expectation (Regex) and creating unit tests.

tests/test_configuration.py

@@ -0,0 +1,11 @@
+#!/usr/bin/env python
+import unittest
+from cachet_url_monitor.configuration import Configuration
+
+
+class ConfigurationTest(unittest.TestCase):
+    def test_init(self):
+        configuration = Configuration('config.yml')
+
+        assert len(configuration.data) == 3
+        assert len(configuration.expectations) == 2