code: function(location, users) {
  		// Remove trailing "/"
  		if(location.substr(-1) === '/') {
  			location = location.substr(0, location.length - 1);
  		}
  		this.location = location;
  		console.assert(Array.isArray(users));
  		this.users = users;
  	}
docs: An annotation shows that a file is under editing
  
  @constructor
  @name {orion.collab.CollabFileEditingAnnotation}
  @extends {orion.collab.CollabFileAnnotation}
  
  @param {string} location - file location
  @param {Array.<string>} users - list of users that is modifying this file