conditional CPM for if-then-else computed properties
Merge pull request #52 from TrueNorth/conditional

"conditional" CPM for if-then-else computed properties
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
Difference (subtraction)
Merge pull request #56 from TrueNorth/difference

Difference (subtraction)
Transforming Ember-cpm in an standard ember addon