Fixes a bug in the MTree implementation.
Merges MTreeNode and MTreeEntry.
Merge branch 'master' of https://github.com/stewartml/near-duplicate-image-search

Conflicts:
	SimilarityIndex/src/similarityindex/framework/PointObject.java
	SimilarityIndex/src/similarityindex/program/IndexAndBulkSearchTest.java
Fixes package spelling mistake.