Add travis support

Author: snapshotpl

.travis.yml

@@ -0,0 +1,20 @@
+language: php
+
+matrix:
+  fast_finish: true
+  include:
+    - php: 5.4
+    - php: 5.5
+    - php: 5.6
+    - php: 7
+    - php: hhvm
+  allow_failures:
+    - php: 7
+    - php: hhvm
+
+install:
+  - travis_retry composer install --no-interaction --ignore-platform-reqs --prefer-source
+  - composer info -i
+
+script:
+  - ./vendor/bin/phpunit