Add support for modifying the sensitivity of onTap() method invocation in BaseSeries class.

[svahidhoss]

I am using this library and I really love it. I have come across a scenario where I would like to let the user modify something on a BaseSeries by tapping on the location they desire.

The problem here is the sensitivity of which these events are detected. This causes the onTap() method of few other unrelated but close BaseSeries to be invoked as well.

I have written the code for that. I would be glad if someone can guide me on how to push those changes.

Thanks!

[svahidhoss]

Resolved in here:
svahidhoss@de01258