Add base travis file to run tests.

Author: BernardoSilva

.travis.yml

@@ -0,0 +1,21 @@
+language: php
+
+env:
+  - PREFER_LOWEST="--prefer-lowest"
+  - PREFER_LOWEST=""
+
+php:
+    - 5.4
+    - 5.5
+
+before_script:
+    - composer dump-autoload
+    - composer self-update
+    - composer update --prefer-source $PREFER_LOWEST
+
+script: bin/phpunit
+
+
+# Use Travis' new container-based infrastructure.
+# See http://docs.travis-ci.com/user/migrating-from-legacy/#How-can-I-use-container-based-infrastructure%3F
+sudo: false