Changes in 0.0.4:
	- Memory leak fixed; thanks to Tony Auckland for spotting.
	- Fixed regression on integer decisions.
	- Integer midpoint between a & b is now floor((a+b)/2)
	rather than min(a,b).
	- Improved error reporting with extract_forest().
	- Order caching for faster training on long numeric features.

Changes in 0.0.3:
	- First public release.