Fix Tree same-name issue
* Problem was despite knowing the full path, click_path would click the
  wrong element if there was a node with the same name elsewhere in the
  tree.
* Came down to not being able to use "//" in xpath even when searching
  from a parent node.  Have to use ".//".
Merge pull request #643 from weissjeffm/tree-fix

Fix Tree same-name issue