[add] configuration of travis

Author: Yoel Monzon

.travis.yml

@@ -0,0 +1,19 @@
+language: php
+
+php:
+  - 5.4
+  - 5.5
+  - 5.6
+  - 7.0
+  - hhvm
+
+before_install:
+  - travis_retry composer self-update
+install:
+  - travis_retry composer install --no-interaction --prefer-source --dev
+
+matrix:
+  allow_failures:
+    - php: hhvm
+    - php: 7.0
+  fast_finish: true