add/remove app from auto run list

toggling the checkbox in the settings now modifies the registry to
maintain a shortcut to launch the wedge when the user logs in.

this doesn't seem to work over network shares (I think the shares aren't
always mounted when it tries to launch the app), but it works otherwise.
It still might be nice to have support for a global start rather than
being in the user registry

fixes #2
Merge pull request #13 from DataSplice/auto-start

add/remove app from auto run list