Refactored the changes_between method to use some handy new Hash extension methods.
Refactored the changes_between method to use some handy new Hash extension methods.

bnadav/vestal_versions,laserlemon/vestal_versions,rthais/vestal_versions,robertleelittleiii/vestal_versions,Skalar/vestal_versions,Leadformance/vestal_versions,alexcrichton/vestal_versions,scottwillson/vestal_versions,houston/vestal_versions