Make test compile
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 #79 from blammit/make-test-compile

Make test compile
Merge pull request #78 from blammit/fix-enabledServiceNames-init

Initialize enabledServiceNames from saved data when account data is load...
Merge pull request #77 from chriadam/master

Add API to AccountManager to allow simpler retrieval of ServiceAccounts for a Provider