added skkiped test logging by wrapping the SkipException with out custom one (issue #178)
added cmd line option for logging skipped tests (issue #178)
allowing to configure the skip exceptions' logging (issue #178)
clonning the same setup we already had for the http logging (issue #177)
Switched to the new Link-Header format for server-contraints as specified in
https://dvcs.w3.org/hg/ldpwg/raw-file/default/ldp.html#h5_ldpr-gen-pubclireqs