Cache not refreshed when importing hierarchial dictionary items using old Dictionary.Import

USync still uses this and crashes when trying to import a child.
Is fixedand more when https://github.com/umbraco/Umbraco-CMS/pull/127 is pulled, but need this for now and until USync is changed to use PackagingService.Import.
Ain't bothering with tests, I've sweared and debugged all day, and this fixes it. :)

Sorry about commit comment, very delayed and frustrated atm.