How about refactor this gem to track upstream js's api

[xiaods]

From recent code review, I found many more code is deprecate and ugly code. what's happen for nest step?
I plan to refactor it by a driven a demo site to refactor this gem.
this:
https://github.com/xiaods/highcharts-bootstrap

first, if you would like some chart , you can send a request to this repo.
second, if lazy_high_charts can render, i will send a demo to this project.
third, through your feedback, i can refactor this gem to involved the feature.

done.

[xiaods]

I have bundle a sample project to represent this gem's ability.