Get handle on the instance of chart created from controller

[sr-nu]

As the created instance is not added to root/controller scope, it is not possible to interact with the instance (eg: SelectedSegments on chart instance.) is difficult. Can the instances be added to the controller or Root scope?

[LosD]

+1, that would also fix #50.

[Greynight]

+1

[ta4ka]

+1

[72gm]

yeah, some (nice) way of interacting would be good... sort of defeats the purpose to use Angular then have to write some non angular code to interact with it