Moved import in sipsimple.util to remove import problems

Ignore-this: d2dd29e6cc6f7ca751237f5f92db6686

darcs-hash:20090423145934-1e3d8-40619683cd3623c1f1121dd210937f3bb9b4c612
Modified way in which a relative ResourcePath is normalized

Ignore-this: 4a411293c53885cb2e2fc5942c515050

darcs-hash:20090423151046-1e3d8-f5ce1774850dda2b214f8fba1765dffd956f3922