Start a phpunit.xml file.
Remove webroot/test.php

Running tests will require the CLI for now or a tool like VisualPHPUnit.
Including a shabby web-runner is less than ideal for a number of
reasons:

* It requires additional maintenance for CakePHP.
* It is not useful in a CI/IDE integration environment.
* Some people leave it in the app when they deploy, causing possible bad
  things.
Add a test bootstrap file.

Make it easier for people to know where to add test bootstrapping.
Merge pull request #34 from cakephp/phpunit-only

Remove web test runner, and only use phpunit.