v0.1, 2013-07-17 -- First release.

v0.2, 2013-07-18
	* fixed spelling error in __all__

v0.3, 2013-07-23
	* bug fix:
		off-by one error caused the queue to not reheapify properly in rare cases when an existing item in position 2 had its pkey was decreased below that of its parent (the root).