[contactsd] Deactivate contacts on SIM removal

Rather than deleting SIM contacts when the SIM is removed, contacts
read from the SIM should be deactivated.  Then if the SIM is later
reinserted, they can be reactivated, maintaining any relationships
they previously participated in.
Merge pull request #57 from matthewvogt/deactivate-contacts

[contactsd] Deactivate contacts on SIM removal