MDL-51458 Testing: Support for Travis-CI.org
MDL-51458 Testing: Support for Travis-CI.org

This commit adds support for community use of travis-ci.org and allows
developers to get free testing of their changes in multiple PHP
environments, and multiple database servers.

Use of this feature requires setup on travis-ci.org, and is not supported
by Moodle HQ.

Results supplied by travis-ci.org are for your convenience only, and tests
will still be applied separately by the HQ integration servers during
integration.

dilawar/moodle