code: function _extractTransitions( prop, stateView, nextView )
  	{
  		var groupedTransitions = [];
  		if( prop.transitions ) { // if more transitions exist, add them
  		 	groupedTransitions = prop.transitions.map( ( transitionObject ) => { 
  		 		return transitionObject; 
  		 	});
  		}
  		prop.views = unique( prop.views, [ stateView, nextView ] );
  		groupedTransitions.unshift( { transitionType : prop.transitionType, views : prop.views } );
  		return groupedTransitions;
  	}
docs: extract transition information
  and extract data if transition information is
  an array of transitions
  @param  {onbject} prop
  @param  {string} stateView - id of state view
  @param  {string} nextView  - id of view this transition goes to
  @return {array} array of transitions fot this action