seems to hold up pretty well.
uv::hl API is affected.. had to do work on tests and std::timer code that
leverages the global loop/high_level_loop API.
see test_stress_gl_uv_global_loop_high_level_global_timer for a stress
example.. it takes a while to run, but it exits cleanly (something I could
never accomplish with earlier iterations of the global loop)
.. leveraging std::uv, we have:
timer::delayed_send - send a value over a provided channel after the
timeout has passed
timer::sleep - block the current task for the specified period
both of these fns (and everything that goes in timer.rs) leverage the
uv_timer_* API
