index.json now expected to live in .stubby in home directory.  Also now ...

...possible to install a new RegistryItem from the commandline

This one is a little more complicated.  In the process of getting things up and running so I could look at the process method I ran into a few weirdnesses.

This should allow the installation of a registry entry that doesn't exist yet.  Currently it only supports specifying a file as the source.