[API Change] Initialise: Make the path argument optional

[kkjamie]

Currently the initialise function has this signature.

public static bool Initialise(string path, string cultureName = null)

The path an be optional and it would look in the root of resources.
It would be also neat to have an overload that would take the tables, since they may already be loaded and serialized on an object in the scene/prefab