Merge pull request #20 from drupal-composer/travis-build

Fix build process for php 5.3

Author: derhasi

.travis.yml

@@ -1,8 +1,12 @@
 language: php
+dist: trusty
 php:
   - "5.5"
   - "5.4"
-  - "5.3"
+matrix:
+  include:
+    - php: "5.3"
+      dist: precise
 install:
   - composer install
 script: