xlisp 64: setup travis script with cl-json
xlisp 64: setup travis script with cl-json

- restructuring for readability
- added documentary comment

exercism/xlisp,verdammelt/xlisp,verdammelt/xlisp,wobh/xlisp,TatriX/xlisp,wobh/xlisp,TatriX/xlisp,exercism/xlisp