Travis: test lint on 5.3

Author: fprochazka

.travis.yml

@@ -0,0 +1,12 @@
+language: php
+
+php:
+  - 5.3.3
+  - 5.4
+  - 5.5
+
+before_script:
+  - composer self-update
+  - composer install --no-interaction --prefer-source --dev
+
+script: ./parallel-lint --exclude vendor .