Since there are tests, lets add a config for Travis.

- config comes with Composer cache enabled

.travis.yml

@@ -0,0 +1,17 @@
+sudo: false
+
+language: php
+php:
+  - 5.3
+  - 5.4
+  - 5.5
+  - 5.6
+  - 7.0
+
+cache:
+  directories:
+    - $HOME/.composer/cache
+
+install:
+  - composer install --prefer-dist
+