Fix Dockerfile
Merge pull request #43 from pmorie/update

Fix Dockerfile
Add ability to specify a git ref for a source
Merge pull request #45 from pmorie/ref

Add ability to specify a git ref for a source
Rename debug to verbose
Remove extended build functionality
Merge pull request #46 from pmorie/extended

Remove extended build functionality
Merge pull request #47 from ncdc/rename-debug-to-verbose

Rename debug to verbose
Allow non-root USER

Add sti-fake-user Dockerfile which extends sti-fake and runs as a
non-root user.

Add integration test to ensure that non-root images work ok.

Fix issues with support for non-root users:
- set config.User prior to committing if the base image has a USER
- workaround issue in Docker where you can't run a container from an
  image whose original container had a file bind mount, and you don't
  specify something to satisfy that file bind mount when running.
Merge pull request #48 from ncdc/non-root-user

Allow non-root USER
Add parameter to STI build to invoke an optional callback url
Merge pull request #44 from derekwaynecarr/add_callback_to_build

Add parameter to STI build to invoke an optional callback url