Added ResourceURI that considers the sip: prefix implicit when comparing

Ignore-this: af7951725d6a0a0f96e18058e98750b2

darcs-hash:20120904135533-b22ec-38ea1d4549e3a65226b0f396f56f2d439c64e513
Compacted code building the RLSNotify content

Ignore-this: 348bb13d778e044f72e5381b44c73752

darcs-hash:20120904153539-b22ec-5dc23d90fb455bc43728f2285318cd4dd32220b0