Added initial_delay to WavePlayer, replacing initial_play

Ignore-this: 5a6fe7ccf4dde855bef83f9add2dab43

darcs-hash:20131115134051-56b4d-0df534fa4c9b7e8b96ca4ee40fe76f02e62df20b
Always use timezone aware timestamps in MSRP streams

Ignore-this: d9fa5d76781e9b10d0c089d05484fe7b

darcs-hash:20131120083835-56b4d-5c9df232f6dde30028da15e3cd7503a97eda9b02
Make sure MSRPlib always gets bytes, not unicode

Ignore-this: 75364c4bce9c7b40f6ea535964ea3dc

darcs-hash:20131120090806-56b4d-36912c5b168a8c5444f41154830c0cb20de8d4ea