Fix: some unit tests' strings of HTML were missing `tbody` elements.
Merge pull request #503 from mightyiam/test_tbody_creation

Closes #503. Added some missing tbody elements to unit test expectations
Use `strictEqual` instead of `deepEqual` in `wymEqual`.

`strictEqual` is simpler and probably faster.
Merge branch 'master' into beautified_html_in_unit_tests
In `wymEqual`, the second, beautified, assertion, is now conditional.

It will be run only if the first assertion failed.