update the way of embedding Chart.js
update the way of embedding Chart.js

https://github.com/chartjs/Chart.js/releases
Starting with v2.2.0-rc.1 Chart.js uses a new build system. We no longer include the checked in files (dist folder) in the repository.

Usage:
https://github.com/chartjs/Chart.js/blob/master/docs/00-Getting-Started.md#bower
valor-software/ng2-charts,valor-software/ng2-charts,Blueliv/ng2-charts,valor-software/ng2-charts,Blueliv/ng2-charts,valor-software/ng2-charts