Allow selective dissociation of handlers from file extensions.

PR:		1799
Submitted by:	Ryan Bloom <rbbloom@us.ibm.com>
Reviewed by:	Ken Coar


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82312 13f79535-47bb-0310-9956-ffa450edef68