Some travis improvements

Author: nickvergessen

.travis.yml

@@ -7,6 +7,13 @@ php:
   - 5.6
   - hhvm
 
+matrix:
+  fast_finish: true
+
+branches:
+  only:
+    - master
+
 before_script:
   - php composer.phar install --dev --no-interaction --prefer-source