Fixed a typo
Merge branch 'dev' of https://github.com/CenterForOpenScience/hgrid into dev
Added tests and functions for getting the path from a Tree or Leaf from itself to the root, and also from being able to do that just by having the HGrid and the ID of the item.
Tests and functions for whichIsContainer, a handy function that, given to node ids, will tell you which, if either, of those nodes contains the other.
Removing highlight whenever the _targetFolder is cleared. This should fix #84.
Fixed typo
Fixed issues from the code review.