Update SetupTestingEnvironment.rst

Fix the broken link in the Sikuli testing explanation

Remove the references to TEST_VISTA_FRESH_M_DIR from the XINDEX testing
explanation

Introduce the MUnit testing explanation

OSEHRA-ID: http://issues.osehra.org/browse/OAT-82
Change-Id: I48f399a75508318daebf6b578db9e4be7fc41528
Merge "Update SetupTestingEnvironment.rst"