user:
var Grade = require('./src/node-grade');
var grade = new Grade({
img : './res/inside-out.jpg'
});
/*
background-image: -webkit-linear-gradient(135deg,rgb(107,60,154) 0%,rgb(59,1,152) 75%);
background-image: linear-gradient(135deg,rgb(107,60,154)
0%,rgb(59,1,152) 75%);
*/