fix for MDXMLINT-7 from Simon P. Ditner .  Added config option disable-100-continue to disable the  Expect: 100-continue HTTP 1.1 header so that it will work with lighthttpd.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@5131 d0543943-73ff-0310-b7d9-9358b9ac24b2