Log Message:
Update p5-CGI-Application to 4.50.

Changes from previous:
4.50 Thu Jun 16, 2011

    [FEATURES]
    Better PSGI support in the core
    - run_as_psgi() works like run, but directly returns the expected PSGI \ 
response structure
    - psgi_app() wraps up all the PSGI bits to call and run the application and \ 
return a PSGI
      code ref:

        $psgi_coderef = WebApp->psgi_app({ ... args to new() ... });

    [DOCUMENTATION]
    - docs for header_props() were improved

    [INTERNAL]
    - source control management was moved from darcs to git. Those who prefer
      darcs are are more familiar with it are advised to try the darcs-git.py
      wrapper for git.

    - The test file psgi_app.t is missing from this release and will be added later.