[SMLRContactsProvider] added external const SMLRContactsProviderErrorDomain
[SMLRContactsProvider] added error codes enum
[SMLRContactsProvider] now checks address books permissions
[SMLRAddressBookViewController] now showes Alert for unknown address book errors
[SMLRAddressBookViewController] now showes special messaged on ContactsProviderErrors
[SMLRAddressBookViewController] now refreshes when appplication became active
[SMLRAddressBookViewController] removed changed settings notification as didBecomeActive is enough
[SMLRAddressBookViewController] added some logging
[SMLRHttpsPostError] added
[SMLRHttpsPost] now logs if offline error is detected
[SMLRContactsProvider] now handles https post offline error
Merge pull request #11 from simlar/pullrequest-address-book-showes-error-message-for-contacts-provider

Pullrequest: Address Book showes error message for contacts provider
[images] added image asset BackgroundTile
[SMLRAddressBookViewController] now sets tiling background to table view and its seperator color
[SMLRAddressBookViewController] gui styling: now table cells are semi transparent
[SMLRAddressBookViewController] now set table section header myself
Merge pull request #12 from simlar/pullrequest-address-book-styling

Pullrequest: Address Book Styling
[SMLRAddressBookViewController] now shows alert if offline
[SMLROfflineViewController] removed
[SMLRAddressBookViewController] now removes alerts when app is becoming in active