Sum (addition) computed property
Update README to account for #48, #50, #52
Merge pull request #50 from TrueNorth/sum

Sum (Addition)
Merge pull request #53 from TrueNorth/update_readme

Update README to account for product, sum and conditional
Update changelog with new CPs
Merge pull request #54 from cibernox/update_changelog

Update changelog with new CPs
Quotent (division)