Auto-build docker on commit/push

[chooper]

It would be nice if we could take advantage of the github webhooks to request an automatic rebuild of the available docker binaries on get.docker.io

[shykes]

Copying @niallo on this one since I know he's working on something similar.

[niallo]

I have a Strider instance building my fork of docker on each commit hosted on dotcloud at https://docker-niallo.dotcloud.com.

Next steps:

1. Pull request to add strider-custom.json to dotcloud/docker repo. This tells Strider how to build Docker (run make)
2. Send Strider invite to someone with admin privs on dotcloud/docker repo to setup CI (@shykes ?)
3. Integrate script to upload binaries to S3