Adding TravisCI config.

Author: octalmage

.travis.yml

@@ -0,0 +1,21 @@
+language: php
+
+php:
+  - 5.3
+  - 5.6
+  - 7.0
+
+env:
+  - WP_VERSION=latest WP_MULTISITE=0
+  - WP_VERSION=3.0.1 WP_MULTISITE=0
+  - WP_VERSION=4.5 WP_MULTISITE=0
+
+matrix:
+  include:
+    - php: 5.3
+      env: WP_VERSION=latest WP_MULTISITE=1
+
+before_script:
+  - bash bin/install-wp-tests.sh wordpress_test root '' localhost $WP_VERSION
+
+script: phpunit