Add CI w/ travis

Author: timgws

.travis.yml

@@ -0,0 +1,15 @@
+language: php
+
+php:
+    - 5.5
+    - 5.6
+
+include:
+    - php: 5.5
+      env: dependencies=lowest
+
+before_script:
+    - composer self-update
+    - composer install --prefer-source --no-interaction --dev
+    - if [ "$dependencies" = "lowest" ]; then composer update --prefer-lowest --prefer-stable -n; fi;
+