Work on #87

Implement a test suite, including Travis-CI integration

tests/test_boards.py

@@ -0,0 +1,17 @@
+from __future__ import (
+    unicode_literals,
+    absolute_import,
+    print_function,
+    division,
+    )
+str = type('')
+
+
+import pytest
+
+from gpiozero.pins.mock import MockPin
+from gpiozero import *
+
+
+# TODO boards tests!
+