Improvments

Non-data messaging is now sent to standard error, so that it
doesn't interfere with piping data to other safe commands.
Add support for recursive move/copy/delete

Users are now able to move, copy, or delete
trees in Vault recursively, via the -R flag.
This will prompt for confirmation. If you wish
to ignore confirmation and copy/move/delete blindly,
use the -f flag as well.

NOTE: Vault does not appear to delete empty directories,
which may lead to confusion after a move/delete, and
the directories still appear. Any keys/values inside
those directories have been removed.
In order to properly display, copy, and move these, safe
now makes a distinction between node1/ and node. This
will show up in safe tree as a blue directory node, and a
green leaf node.
safe tree and safe paths will now hide any intermediary
nodes that do not have any leaf nodes underneath them (or any
of their child-intermediary nodes).
Added request debugging

Bug Fixes

Fixed a bug in safe tree and safe paths whereby
the listings of node1/ would be duplicated, and the listing
of node1 was overlooked.