Added support for sun.misc.Unsafe.park and sun.misc.Unsafe.unpark
Added test for the sun.misc.Unsafe.park and sun.misc.Unsafe.unpark native methods.
Fixed unit conversion of nanoseconds
Made park/unpark's output not susceptible to non-determinism when the output is compared. Since determinism isn't the goal of this test, we can ignore the issue altogether.
Fixed typo of nanoseconds
Merged unpark_expired into choose_next_thread
Merge pull request #224 from bmcdorman/master

Added support for park() and unpark() in sun.misc.Unsafe