Add support for contentType in utils.ajax. Used in backbone.
Add support for contentType in utils.ajax. Used in backbone.

psimyn/exoskeleton,paulmillr/exoskeleton,psimyn/exoskeleton,Mordentware/exoskeleton,browniefed/exoskeleton,paulmillr/exoskeleton,Mordentware/exoskeleton,browniefed/exoskeleton