Added some unit tests
Fixed tests
Fixed module path in travis
Merge pull request #14 from silverstripe-iterators/pulls/tests-1.1

Backporting tests to 1.1, mainly to shut up travis about failures ;)
opauth_path doesn't work for second-level project directories.

This would fail if your site was at http://localhost/ss3, the path would
resolve to http://localhost/opauth/ because of the prefixed slash.