add feature-usage-tracking command to help ToC
logout user when the cookie has expired
fixed unit tests
Merge pull request #235 from Icenium/dragnev/logout-on-expired-cookie

logout user when the cookie has expired
Changes after code review

don't track the usage of login commands

because usage tracking requires you to be logged in in the first place

also:
* don't clobber user settings
* don't prompt for consent when the login cookie is expired
Merge pull request #236 from Icenium/dragnev/no-analytics-on-login

don't track the usage of login commands
Preuninstall script that stops the adb service process