i guess lodash.isinteger package is redundant

hi all;

i guess `Number.isInteger` can be used instead of `lodash.isinteger` for `Col.js`.

exp. old: 
```javascript
import isInteger from 'lodash.isinteger';
...
...
isInteger(p[k])
```
exp. new: 
```javascript
Number.isInteger(p[k])
```

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isInteger