Make tests runnable from anywhere

Tests no longer implicitly require that the caller be in
a specific working directory.

Signed-off-by: Will Beason <willbeason@gmail.com>

README.rst

@@ -20,6 +20,11 @@ associated tests to work.
 - 7zip
 - ffmpeg
 
+Tests
+----
+To run tests::
+
+   python -m unittest test.Wikiq_Unit_Test
 
 TODO:
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