Move/rename file command

[williamspiro]

With the CLI, a move/rename is actually a new file in the Design Manager, which means the old file lingers, and history about the original file is lost.

cc @mattcoley @gcorne @miketalley

[miketalley]

Reopening this to explore the possibility of modifying the watch command to use the new endpoint so we can retain revision history for the renamed file.

[miketalley]

I had been working on a solution that retains the revision history for watched files when renaming/moving here, but it seems to me there is not a good way to do this currently based on how node events work. @williamspiro