Have tvOS CoreDataModel init's storeType default to CachesDirectory URL

[cgoldsby]

CoreDataModel init method storeType defaults to a SQLite DB using the Documents Directory URL: storeType: StoreType = .SQLite(DocumentsDirectoryURL())

On tvOS, the Document Directory is not available and it would be a nice enhancement to have the init method default to the Caches Directory.

A proposal would be to refactor DocumentsDirectoryURL() to DirectoryURL() and add an availability check when creating the directory URL:

var searchPathDirectory = .DocumentDirectory
#if os(tvOS)
    searchPathDirectory = .CachesDirectory
#endif
return try NSFileManager.defaultManager().URLForDirectory(searchPathDirectory, ...)

[jessesquires]

Hey @cgoldsby ! 😄

Sounds like a great idea. Would you like to submit a pull request?

If so, let's call it DefaultDirectoryURL().

[cgoldsby]

Will do.