Refactors and adds bin reservoirs for better performance
Improves performace for sum, density, percentile, sample, etc.
Bump version
Adds a clone when computing the sum
Test implementations w/ targets
Nit fixes
Bump to Clojure 1.5, adds convenience functions and regression tests
Fix so both reservoir implementations produce the same histograms
Bump to Clojure 1.5.1
Updates readme for new histogram release
Nit fix
Fix bin-insert! so it properly updates min/max
Return nil target sums for empty histograms
Fixes sum when the min value and the first bin's mean are the same
Bumps incanter to 1.4.1

This version of incatner is more friendly to Clojure 1.5, so the
charting examples now work again.