new classes
Merge http://github.com/erinlkirby/histogram

Conflicts:
	Axis.java
	DataPoints.java
	Histogram1D.java
	Histogram2D.java
	Histogram2DTest.java
	Histogram3D.java
	Histogram3DTest.java
	MultiIndex.java
	StatNumber.java

 Changes to be committed:
	modified:   Axis.java
	modified:   DataPoints.java
	modified:   Histogram1D.java
	modified:   StatNumber.java