Reviewed by hyatt.

        Adding support for external entity declarations in XSLT.
        http://bugzilla.opendarwin.org/show_bug.cgi?id=7184
        <rdar://problem/4271696> support external DTD references in XSLT

        * fast/parser/external-entities-expected.checksum: Added.
        * fast/parser/external-entities-expected.png: Added.
        * fast/parser/external-entities-expected.txt: Added.
        * fast/parser/external-entities-in-xslt-expected.txt: Added.
        * fast/parser/external-entities-in-xslt.xml: Added.
        * fast/parser/external-entities.xml: Added.
        * fast/parser/resources: Added.
        * fast/parser/resources/external-entities.dtd: Added.
        * fast/parser/resources/external-entities.xsl: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@12751 268f45cc-cd09-0410-ab3c-d52691b4dbfc