Log Message:
Update p5-Plack to 0.9984.

Changes from previous:
0.9984  Mon Oct  3 09:55:05 PDT 2011
    [BUG FIXES]
        - WrapCGI: Close wrapped CGI's STDIN handle (rwstauner)

    [IMPROVEMENTS]
        - WrapCGI: improved docs (chromatic)
        - Request: Do not destroy HTTP::Body upload headers (mst)

0.9983  Tue Sep 27 09:55:48 PDT 2011
    [BUG FIXES]
        - Fixed a typo in nginx FastCGI configuration
        - Clone HTTP headers in Response->finalize #237 (chip)
        - Fixed Directory app not displaying the right path in its title
        - Changed IPv6 default listen address to wildcard (ollyg)
        - Fixed the FastCGI handler with web-server mode on Win32

    [NEW FEATURES]
        - Added psgix.harakiri for Apache handlers

    [IMPROVEMENTS]
        - Prefer Corona when Coro is detected #236 (chip)
        - Increased Pod::Usage dependency
        - Improved Plack::Test documentation (chromatic)
        - Lint now checks if SCRIPT_NAME eq '/' which is forbidden in the spec \ 
(chromatic)