corrected the servlet mapping url pattern added the simpleUploaderServlet (used when uploading images to server, but currently not used on our tool authoring pages)
fixed up testCreateToolSessionDefaultContentMissing test case. after removing default content, it will restore the right default content with the default content id that was assigned to it initially
fixed up testCopyToolContentWithDefaultContentMissing test case. after removing default content, it will restore the right default content with the default content id that was assigned to it initially