Check if one array contains all the entries of another
npm install array-contains-allUsage:
```
$ npm install --save array-contains-all
`javascript``
var a = [1, 2, 3];
var b = [1, 2];
if (arrayContainsAll(a, b)) {
// Yeehaa, look ma, we did it!
}
if (arrayContainsAll(b, a)) {
// Not today sucka!!!
}