set up Travis CI for Tracks

.travis.yml

@@ -0,0 +1,16 @@
+language: ruby
+rvm:
+ - 1.9.3
+ - 1.8.7
+
+before_install:
+  - "export DISPLAY=:99.0"
+  - "sh -e /etc/init.d/xvfb start"
+
+script: "bundle exec rake ci"
+
+bundler_args: --without development
+notifications:
+  recipients:
+    - tracksapp@googlegroups.com
+

lib/tasks/continuous_integration.rake

@@ -0,0 +1 @@
+task :ci => [:test, :cucumber]