Using only required WSGI variables
WSGI has a specific list of variables that are required. wsgiApp shouldn't give an exception when any variable not on this list is omitted. Specifically it came up that REMOTE_ADDR is expected, and the Paste test fixture hadn't been providing that variable; Paste has been updated, but CherryPy should also be fixed. See http://www.python.org/peps/pep-0333.html#environ-variables for the list of required variables.
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