Add native Array.to/fromJSArray (for ports)
Add Utils.isJSArray for #576
Fix Array.js file
Fix #576 for Array and ports with tuples
Change to instanceof Array
Undo add native Array.to/fromJSArray
Merge pull request #585 from Xashili/array

Fix #576 for Array when having ports with tuples
Merge remote-tracking branch 'elm-lang/master' into webgl