Rename domain to project everywhere.

This code is external to CCHQ so it uses external terminology
on the command-line, and it makes sense to do so everywhere.
Restore default travis notifications
Merge pull request #3 from kennknowles/domain-is-now-project

Rename domain to project everywhere.
domain -> project in README.md
Merge pull request #4 from kennknowles/restore-default-travis-notifications

Restore default travis notifications
Merge pull request #5 from kennknowles/domain-is-now-project

domain -> project in README.md