TEST: Add travis tests

.travis.yml

@@ -0,0 +1,15 @@
+language: python
+
+python:
+  - 2.7
+
+install:
+  - pip install -e .[develop]
+
+script:
+    # Code style checks.
+    - pycodestyle mopidy_pummeluff
+    - pylint mopidy_pummeluff
+
+    # Build check.
+    - python setup.py build

setup.py

@@ -26,6 +26,12 @@ setup(
         'Mopidy >= 2.2.2',
         'pi-rc522 == 2.2.1',
     ],
+    extras_require={
+        'develop': [
+            'pycodestyle',
+            'pylint',
+        ]
+    },
     entry_points={
         b'mopidy.ext': [
             'pummeluff = mopidy_pummeluff:Extension',