support case...endcase

• support function cascading for vm.push(), vm.execute(), and vm.dictate(), learned from peforth.
• support vm.v('var'), vm.r('var') learned from peforth
• support case ... endcase
• fix bug on || command

project-k renamed from jeforth.js to projectk.js

project-k / projectk.js was missing in r3
To add it even though project-k folder is ignored
Use this git command line: git add -f project-k/projectk.js

failed

dropped

Support 'private' now.

New attribute "private" for jeforth words. When it's true the this word will be invisible when out of the context that means recent private words will be hidden if we switch the context to another vocabulary.

First release

Tested on Windows 10. Support HTML, Node.js, NW.js, HTA, Chrome Extension, and Chrome App.