* sync with MontFerret/ferret
* fix --param handling
When params is converted to map it uses strings.Split,
which slices a string into all substrings separated by :.
* implement GetIn for values.Object
* implement GetIn for values.Array
* rewrite GetIn because values.Object and values.Array implement core.Getter now
* fix bug when GetIn return nil instead of None
* add tests for Object and Array .GetIn
* add GetIn comment and remove 'len(byPath)' check
* fix GetIn comment
* rename method Clone to Copy
* added Cloneable interface
* added Value to Cloneable interface
* implemented Cloneable intefrace by array
* implemented Cloneable interface by Object
* unit tests for Object.Clone
* move core.IsCloneable to value.go
* change Clone function
* move IsClonable to package values