Remove Synchronization section in settings

Currently, it crashes when you check the "Sync tracking apps" box.

We shouldn't really even need the Synchronization section, though.  If people don't want to sync, they can sign out, uncheck the apps they don't want to sync, or just uninstall the app. 

Also, would it be difficult to display the username instead of "Logged in" under the "Account" settings item?
