Single and multi files become selected after treeview drop.
Working implementation for issue #531
Merge pull request #1 from rnirnber/dnd_selection

My first PR merge
Cool...this is way cleaner now...should be ready to close five-three-one unless further changes requested.
Made improvements to node expansion timer as suggested
Merge pull request #2 from rnirnber/testing_rebase

Made improvements to node expansion timer as suggested
Addressing style issues and changed reader.readAsArrayBuffer() calls to run through proxied futures/completers
Merge pull request #4 from rnirnber/testing_rebase

Addressing style issues and changed reader.readAsArrayBuffer() calls to ...
Merge pull request #6 from rnirnber/master

Getting another fork caught up to master