Add RFC-defined extensions for pkix certificates.

Add documented (but unregistered) Microsoft file extensions that
people use on the Internet.

http://www.microsoft.com/technet/isa/2004/plan/mimetypes.mspx



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@571285 13f79535-47bb-0310-9956-ffa450edef68