Updated scala version to 2.10.0 (final)
moved all tests to the `scalax.frp.test` package
just a couple of TODO markers for my own info
Moved everything from `scala.frp` into `scalax.frp`
EventStream.end should use a `Time[T]` to return the current time as a
T, instead of defaulting to System.currentTimeMillis as a Long.