Saucelab integration

## Sacelabs integration

Please don't merge uptil [WIP] tag is added to a branch, i.e work in progress.

## Todo
- [x] Basic saucelab integration
- [x] Add readme for usage
- [x] Started Dijkstra algorithm
- [x] Improved gulp file structure using `gulp-load-plugins`. 


## Reference links:

1. [Autoload gulp plugins](http://andy-carter.com/blog/automatically-load-gulp-plugins-with-gulp-load-plugins)
1. [Building with gulp](http://www.smashingmagazine.com/2014/06/11/building-with-gulp/)
1. [Manage frontend dependencies](https://blog.engineyard.com/2014/frontend-dependencies-management-part-2)