getList
Gets a List of instances.
    connection.getList( set )
  
  Gets a List of instances using the connection by calling
getListData.
connection.getList({parentId: 5}).then(function(list){
});
Note that can/map adds getList to the instance's
constructor function.
Parameters
- set 
{Set}:A set object that represents the list of data to load.
 
Returns
 {Promise<List>}: 
Returns a promise that
resolve with a List if getListData is resolved.  The promise is rejected if getListData is rejected.