Upgrade to Highcharts 4.x

[pgollakota]

The existing version in demo is Highcharts is 2.x.

[atodorov]

QA note: it would be great to come up with some testing method which will actually verify that both jQuery and Highcharts JavaScript works when integrated with the django backend. This can be added to the Travis-CI matrix as well and make it easier for upgrades.

[gitanupam]

Hi - just wondering if anyone knows the status of this request?
Thanks

[atodorov]

@gitanupam as far as I know nobody is working on this. Feel free to contribute a PR.

I have to sort out through other issues and do a substantial internal cleanup and add more tests before even thinking to migrate to newer Highcharts. You can give it a try and report how it works, even send me PRs but that would be completely on your own risk and not officially supported at the moment.