Reviewed by Darin.

    Reviewed by Darin.

        - fix http://bugzilla.opendarwin.org/show_bug.cgi?id=8157
          Make HTTP tests using Perl use .pl extension

WebKitTools:
        * Scripts/run-webkit-tests: Added support for running .pl and .php tests,
          removed support for .text. Reduced the number of places that explicitly list supported
          extensions. Some of the changes come from bug 8121, the patch for which got landed only
          partially.

LayoutTests:
        * http/tests/incremental/slow-utf8-text.pl: Added (renamed from .text).
        * http/tests/incremental/slow-utf8-text.text: Removed.
        * http/tests/incremental/split-hex-entities.pl: Added (renamed from .html).
        * http/tests/incremental/split-hex-entities.html: Removed.
        * http/tests/incremental/.htaccess: Removed.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@13818 268f45cc-cd09-0410-ab3c-d52691b4dbfc