Problem: When a json message arrives in pieces, the start is dropped and
the decoding fails.
Solution: Do not drop the start when it is still needed. (Kay Zheng) Add a
test. Reset the timeout when something is received.
Problem: When a job ends the close callback is invoked before other
callbacks. On Windows the close callback is not called.
Solution: First invoke out/err callbacks before the close callback.
Make the close callback work on Windows.
