Finished implementation of wye.

 Fixed correct Kill propagation in haltL and haltR (that were renamed to killL and killR)
Implemented runAsync
Some basic wye testing
+ repeatEval
+ SourceSyntax
implemented Process.awakeEvery
More wye spec added

Implemeneted more specs
Fixed runFoldMap
Fixed cleanup of wye
Added more cleanup tests for wye
Added merge.million specs, merge.drain specs added