v0.2.0 -
	* fix memory leak of snapshots in HeapDiff #15
	* HeapDiff.end() throws an exception if invoked more than once.
	* aggressively clean up snapshots, at end() rather than next gc

v0.1.5 -
	* compiles on windows (thanks @jmatthewsr-ms! sorry to make you wait)

v0.1.4 -
	* migrate to node-gyp (thanks @jhaynie for getting it started)

v0.1.3 -
	* node 0.8 support

v0.1.2 -

	* Addition of unit tests (running on travis)
	* fix bug whereby events would not be emitted when listeners use .once()
