Add Highcharts support to Zeppelin

zeppelin-highcharts module, which enables Highcharts functionality for Spark DataFrame. zeppelin-highcharts is a model converting from Spark DataFrame to Highcharts.

see github project for zeppelin-highcharts.

https://github.com/knockdata/zeppelin-highcharts

While currently, it requires few extra step for users to use this feature.
> Manual Link Highcharts js. And each notebook need link it manually.
> Add zeppelin-highcharts jar file to dependency

After some discussion with Highcharts Account Manager. It should be OK regarding license issue. What needed is add explicit description in the document. See the mail conversation below.

Rockie,

Only users who will be using Highcharts for commercial purposes needs a license.
Users who use Zeppelin for commercial purposes, but will not use Highcharts, does not need a license from us.

I hope this helps.

Let me know if you need further clarification.

Best regards,
Anita Nesse
Global Account Manager
phone: +47 950 42 263

Hi Anita

Since Apache Zeppelin using Apache 2 license.

If Highcharts is bundled together with Zeppelin. Does it mean the whole Zeppelin need follow Highcharts license?

Which option in following list apply?

1. The whole Zeppelin need follow Highcharts license. Users who use Zeppelin for commercial usage need have a valid Highcharts license? Even the user don’t use the Highcharts feature.
2. The whole Zeppelin still use Apache license, Highcharts license apply if users use Highcharts feature. Users who use Zeppelin for commercial usage does not need have a valid Highcharts license as long as they are not using Highcharts feature.

Thank very much.

// Rockie