IDataFrame.inflateSeries has incorrect type

[yushiyangk]

Using data-forge 1.10.3, IDataFrame.inflateSeries has type defined as follows:

inflateSeries<NewValueT = ValueT>(columnName: string, selector?: SelectorWithIndexFn<IndexT, any>): IDataFrame<IndexT, ValueT>

I believe this is wrong, as the selector argument is a function that takes each value in the series as its arugment; it should not be the IndexT.

[ashleydavis]

Please feel free to make it look the way you want submit a PR. I'll run the tests and see if it looks ok. If everything checks out we can publish a new version.