Delete todo file after logout and after changing Dropbox path.
Force a refresh after changing Dropbox path.
Display a warning message before logout or changing Dropbox path if there are local changes that haven't been pushed.
Renamed preference keys that violated our conventions.
Merge pull request #404 from chuckbjones/397-cleanup-and-sync-on-path-change-rc

Cleanup and force refresh after changing file location, closes #397