How add additional column Header (Column Header Span)?

[Menogus]

How add additional column Header like Product/Customer on this screen (like Column Header Span in prev. version):
http://allenfang.github.io/react-bootstrap-table/images/react-bootstrap-table-sample.png

??

[AllenFang]

@Menogus so far we dont have column span feature, I will implement it when I get time.

[AllenFang]

Close it due to duplicated issue