Errors with drilldown

The plugin probably needs to define its own animateFrom and animateTo methods to be picked up by the drilldown module.

#### Live demo with steps to reproduce
Demo:
- http://jsfiddle.net/z9nstbz8/

Click on a column and observe errors in the console.


#### Affected browser(s)
All

**_Workaround_**
Merge new series with the current point series options.

Example:
- http://jsfiddle.net/2Lpotqvs/

Start with the plugin's drilldown integration and reproduce the console errors using the live demo at http://jsfiddle.net/z9nstbz8/. Compare the failing setup with the workaround demo at http://jsfiddle.net/2Lpotqvs/; done means clicking a column no longer produces drilldown errors.

Written by the indexing model from the issue text.