Port over nikolayb's framework

[maxcutler]

Bring over the code from GitHub?: ​https://github.com/nb/wordpress-tests

This includes the basic phpunit.xml config, the bootstrapper, and base test class.

(In [760]) Initial port of nikolayb's phpunit-based framework.

See #42.

In #100, I suggest we should always install. Too many variables to account for.

(In [875]) Rename the unit tests wp-config.php to wp-tests-config.php. Also:

• Rename wp-testdata to data
• Rename wp-testlib to includes
• Rename wp-testcase to tests
• Begin to remove files from the old test suite we no longer need to port code from

fixes #98. see #42.

Other things that may need to be ported from the old framework:

• Mock PHPMailer (see #47)
• wp_die() handler overrides
• Plugin support (see #39)
• Confirm error handling is proper, including the stuff from WPTestCase: http://unit-tests.trac.wordpress.org/browser/branches/legacy/wp-testlib/base.php?rev=752#L27.

[880]

(In [915]) Make some sense of the original formatting tests from [121].

• Dissolve the old directories, moving data into /data/formatting/ and tests into /tests/formatting/.
• Remove the old formatting testcase, instead using straight file() calls functioning as PHPUnit data providers.
• Bring back the tests for the "funky javascript fix" in the form of testing _convert_urlencoded_to_entities(), removed in [403].

see #42, see #12.

(In [924]) By default, do not execute the ajax tests. They are slow due to the requirement that they run in a separate process for DOING_AJAX reasons.

As they will be run separately, stop running ajax tests in a separate process. The exception is autosave, which has DOING_AUTOSAVE.

When the full test suite is run as plain phpunit, add a message to remind the developer that ajax was not run.

see #49, see #42.

(In [925]) phpunit -c multisite now runs the suite as multisite. see #49, #42.