Uses absolute min and max for histogram limits, adds percentiles and sampling
More accurately calculate density and drops default bins to 32
Default back to 64 bins
Improves averageTarget
Tiny refactor
Updates the readme and examples with new charts
Fixes total count bug when merging histograms with missing counts
Merge branch 'master' into percentiles

Conflicts:
	src/java/com/bigml/histogram/Histogram.java
	test/histogram/test/core.clj
Use correct # of samples
Bump version
Adds a couple comments and bumps the version
Prep for open sourcing

 - Updates project.clj to be lein2 friendly
 - Clojure namespace clj.histogram -> clj.bigml.histogram
 - Bumps version #
 - Adds license info
Readme updates
Grammar tweak
Removes experimental/buggy heatmap code
Adds NaN check