Add .travis.yml file for continuous integration with Travis CI.

.travis.yml

@@ -0,0 +1,14 @@
+branches:
+  only:
+    - core-tests
+
+language: php
+
+php:
+  - 5.3
+
+script: php artisan test:core
+
+notifications:
+  irc:
+    - "irc.freenode.org#laravel"