Reviewed by Darin.

    Reviewed by Darin.

        - http://bugzilla.opendarwin.org/show_bug.cgi?id=6197
          Would like to use locally installed Apache for testing.

        Added two run-webkit-tests options:
          --http (--nohttp)  - whether to launch Apache (defaults to yes);
          --port - which port to listen on (defaults to 8000).

        Tests in LayoutTests/http are not run directly, and Apache is used instead.
        For example, http/tests/xmlhttprequest/post-content-type.html is loaded as
        http://127.0.0.1:8000/xmlhttprequest/post-content-type.html.

        Also added support for .shtml and .text files. Text files give an empty
        *-expected.txt, but a correct image.

        Apache only listens on the loopback interface. It writes logs to /tmp/WebKit.

        * Scripts/run-webkit-tests:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@12923 268f45cc-cd09-0410-ab3c-d52691b4dbfc