Delegated encoding/decoding of URI values to sipsimple.payloads

Ignore-this: fc5ba0860c23f4e2d1a1fbf51154fa0c

darcs-hash:20100817125422-1e3d8-d6a4b2ba67d1cdd6feeeed79619130f1a054d4d4
Improved XMLElement hashes to allow list elements to be hashable

Ignore-this: 7721a18e2d525edd5be0ed4bd8b45754

darcs-hash:20100820102207-1e3d8-4a5210db1ca431da33034d1618ada2eaff3ef026