Adding "scope" subcommand

Setup a scope subcommand for setting/viewing/unsetting a cloudlet and
blueprint scope for other commands.  In the process, cleaned some files
and added a bit of error handling.  This is not plumbed in anywhere yet,
however, because it is actually somewhat more complex to do so than I
expected, so scope is disabled for the time being.
Fixing blueprint argument error
Merge branch 'master' into 117-scope-commands

Conflicts:
	bin/nepho
Merge pull request #121 from huit/117-scope-commands

Adding "scope" subcommand