Added support for phpUnit.  Fixes #3.

To use:
`./run-tests`
OR:
`phpunit -c phpunit-phpwebsite.xml`

To write unit tests for Global, put them in `tests/`
To write unit tests for your module, put them in `mod/YOURMOD/tests/`
Merge branch 'master' of github.com:/AppStateESS/phpwebsite