Fix for issue #27

If the thumbnail used for the "reuse" was selected, the new thumbnail
is still selected too...
Adding Turkish and Simplified Chinese localizations ( #26 and #28 )

Thanks to dreampowder for the Turkish localization.
Thanks to tianye2856 for the Simplified Chinese localization.
Fix in Facebook grabber

Sometimes, "created_time" and "updated_time" entries are missing from
Facebook's API results.
Fix in GRKPickerViewController

Simply forgot to remove all selected photos if keepsSelection == NO,
when the picker is presented in popover.
minor changes