Update version
Remove Histogram spec
Update spec
Set is now independent of Histogram
Remove hist spec
Remove hist spec reference
Add method to set mutable flag to true
Minor refactoring
Update version
Use Infinity as min initializer instead of Math.pow(2, 53)
Remove stray semicolon
Replace 'value' with 'item' in static set process method
Comments
Move utility methods from top of file to the bottom
Update spec with internal mutability test
Update readme to reflect new Set functionality