code: public Tree putMap(String path) {
  		return putObjectInternal(path, new LinkedHashMap<String, Object>(), false);
  	}
docs: Associates the specified Map (~= JSON object) container with the
  specified path. If the structure previously contained a mapping for the
  path, the old value is replaced. Sample code:<br>
  <br>
  Tree node = new Tree();<br>
  Tree map = node.putMap("a.b.c");<br>
  map.put("d.e.f", 123);
  
  @param path
  path with which the specified Map is to be associated
  
  @return Tree of the new Map