fixed a spelling mistake
adding the unit test scaffold
- writing our first test

STarted by adding our class to the globals so I can access it with the
test suite.

Then I wrote a basic test to make sure that the plugin is in fact
loaded.
- testing the removal of the reviews tab

This tests to make sure that we remove the reviews tab if we want it
gon, and that we don't remove it if the internal options tell us not to
remove it.
forgot the tearDown function
makes sure that the plugin deactivation routines run if we do not detect the main WooCommerce plugin