Initialize enabledServiceNames from saved data when account data is loaded

The enabledServiceNames list was not initialized at account creation,
so an account as always sync'd with a version of this list that excluded
any previously enabled services for this account, thus overwriting the
saved list in the database with an incorrect list.
Merge pull request #78 from blammit/fix-enabledServiceNames-init

Initialize enabledServiceNames from saved data when account data is load...