This changes the prototype of uv_run() from: int uv_run(uv_loop_t* loop); To: int uv_run(uv_loop_t* loop, uv_run_mode mode); Where `mode` is UV_RUN_DEFAULT, UV_RUN_ONCE or UV_RUN_NOWAIT. Fixes #683.
It is clearer and used everywhere else.
Times how long it takes to queue and write out 1,000,000 short strings.