Add first cut of test suites.

Test suite and test registration methods have been stubbed out and
tested. Looks good so far, but there's a lot more to do, particularly
with regard to code cleanup and documentation. Definitely need to work
on detangling the source.
Reorganize source file for better comprehension.

I'm reordering the wp_test.w file in preparation for more comprehensive
documentation. I've made no other code changes.
Add first cut of test suites.

Test suite and test registration methods have been stubbed out and
tested. Looks good so far, but there's a lot more to do, particularly
with regard to code cleanup and documentation. Definitely need to work
on detangling the source.
Reorganize source file for better comprehension.

I'm reordering the wp_test.w file in preparation for more comprehensive
documentation. I've made no other code changes.
Merge branch 'test-suites' of github.com:jgshort/tegen into test-suites
Add additional documentation; flesh out test macros.

The biggest change surrounds both the order of the code and the
documentation accompanying the code, as well as a few macros that I'm
playing with, including WP_TEST_BEGIN, WP_TEST_END and WP_TEST_FAIL.
More will be created shortly.
Add test bootstrap.

With a lot of the test framework fleshed out already, I went back and
began adding tests to test the test framework. This is backwards, but it
is what it is. I'll slowly add tests until I feel confident in the test
framework, but I'm satisfied that it's ready to merge into master at
this point.

 - Add additional documentation.

 - Add test functions to some test suite functions. They're currently
   "in-line" with one another, though this may change.

 - Add bootstrap and test harness utilities, such as wp_test_assert.

 - Clean up test registration method with WP_TEST_REGISTER macro

 - Add utility macro WP_TEST_BEGIN and WP_TEST_END (yuck!) but it's just
   to get the tests bootstrapped; I'll work out something nice, later.

 - Incorporate assertions.

 - Reorganized code, but just so.

 - Fix silly linked-list issue in wp_test_suite_register.