spark-scroll-rekapi: lodash and underscore dependencies

[gilbox]

:crying_cat_face: Multi-faceted problem:

• Currently spark-scroll has lodash dependency while Rekapi has underscore dependency.
• Rekapi does not auto-install underscore

For these two reasons npm install react-spark-scroll-react doesn't work out of the box. The work around is either:

• Alias underscore (using alias feature of webpack or browserify, or whatever)
• Manually install underscore via npm install underscore

Don't have time to mess with this atm so creating this issue instead.