Pacakge removal didn't work with last introduction of returning errors by reference.
OCMock framework added to test target.
Test running in Xcode and AppCode.
Skeleton test class added for Packages.
Refactor: PackageController new property FileManager for IoC.
Defaults on init to defaultManager, meant for dependency injection later on.
PackageController creation tests added.
Package creation reworked.
NewPackageDialog decoupled from lower level API: NSFileWriteFileExistsError.
Introduced new error code to reflect the import case.
Package creation with more test cases.
Package removal tests added.
Package import tests added.
Missing error code added.
Refactor: Removed redundancy of import and remove packages methods.