0.7.0

• Breaking: Align Exoskeleton with latest Backbone (specifically
  jashkenas/backbone#3003).
  • Remove View#find, View#findAll, and View#useNative
  • Remove utils.matchesSelector, utils.delegate, and utils.delegate
  • Remove keepOld property from delegateEvents. Use delegate to add
    individual events now.
  • All hooks from jashkenas/backbone#3003. Instructions here.
• Add Router#execute and Router#atRoot
• Add Collection#_addReference
• Add _.has to utils
• Remove utils.ajax in favor of a plugin
• Model#toJSON now extends a plain object (not one created with
  Object.create(null) for compatibility with third party libs.)