Added the new url module test file. This replaces the original
helpers_test.go file.
The TestUrlPrep test currently fails.
The only minor change to url.go is to add some trace printf's to
UrlPrep.
Mainly this was a change to helpers.MakePermalink, but to get the local server to run correctly,
we needed to redirect the path of the request from /foo to /. In addition, I added tests for the
server's code for fixing up the base url with different config file & CLI options.
