Made animation cancelation less error prone; improved documentation.
Made animation cancelation less error prone; improved documentation.

joansmith/tripleplay,joansmith/tripleplay,tomfisher/tripleplay,tomfisher/tripleplay,tomfisher/tripleplay,joansmith/tripleplay,tomfisher/tripleplay,joansmith/tripleplay,joansmith/tripleplay,tomfisher/tripleplay