customized classes and id on BootstrapTable (#235)

[chunming-c]

fix #235

This PR aims to support customized className and id on BootstrapTable.

[chunming-c]

Hi @AllenFang,

For previous customized classes, take rowClasses or example, it accepted String and Function. However, callback function might take a couple of params like row and rowIndex and I thought it might improper and unnecessary for the table. That's the reason why I only support string here.

[chunming-c]

Besides, should I update the docs as well?

[AllenFang]

Document should be patched only for dev branch, I will update offical docs

[AllenFang]

About #235, I think we need to clarify the class/id is on outter div or table

[chunming-c]

Sure. Let's discuss further. What I think is that the benefit of customizing className or id on the table directly is that it not only allows users to pick up whatever they want but also supports classNames from boostrap.

For example: bootstrap4#tables

You can also invert the colors—with light text on dark backgrounds—with .table-dark.

<table class="table table-dark">
  { ... }
</table>

[AllenFang]

Thanks @Chun-MingChen

[AllenFang]

Patch docs c11539b

[waynebrantley]

@AllenFang
Why create a classes attribute, instead of using the standard className attribute and merging it in?
Just makes easier to self discover API.