Removed PJSIPUA._create_contact_uri method

Ignore-this: d52e95ecab8ef30786197d49bba1ee1d

darcs-hash:20090623120025-1e3d8-f84e1ebbf8b178b1558897f25b59ca3f635139c2
Added Route object to sipsimple.util

Ignore-this: a1b35a189c1e68ccaba19a4b397a2f58

darcs-hash:20090624105040-1e3d8-f4a1ca618cf7e4a6507c605787bab6e16c0c7ed7