Merge pull request #1 from alexmaris/master

Merge latest changes to local forked tree
Updates to address memory and performance issues, as well as reduce serialization footprint
Merge branch 'pr/2'

Conflicts:
	BagOfDecisionTrees/src/decisiontree/BagOfTrees.java
	BagOfDecisionTrees/src/decisiontree/Id3.java
	BagOfDecisionTrees/src/decisiontree/Instance.java
Merge branch 'pr/2'

Conflicts:
	BagOfDecisionTrees/src/decisiontree/BagOfTrees.java
	BagOfDecisionTrees/src/decisiontree/Id3.java
	BagOfDecisionTrees/src/decisiontree/Instance.java
Merge branch 'master' of https://github.com/alexmaris/BagOfDecisionTrees.git
Make log2 a static property