CI for DF14 Warehouse Example
The example demonstrates how to setup CI using CircleCI and java-based Ant Metadata API using Salesforce workbook:
http://www.salesforce.com/us/developer/docs/workbook/forcecom_workbook.pdf
(I'll checkin that PDF just in case it disappears, don't want a 404 link).
If you want to by pass setting up the workbook, you can always spin up a new DE org (https://developer.salesforce.com/) and sign up. Then install this package:
https://login.salesforce.com/packaging/installPackage.apexp?p0=04ti0000000Pj8s