Compatibility with bootstrap v4

Hello everybody and @wenzhixin =)

I just discovered this library and found it amazingly simple and well documented. The only drawback is that I have one project that has been developing with Bootstrap v4, so I decided to start to adapt your project to Bootstrap v4.

I forked the project and created a branch in my repository to commit all the changes.

I still discovering all the features and options that this library can offer so I am migrating as soon as I see that something is broken.

The community can have a look what I’d had developed in my repository.

What is done until now:

• Update the class for the pagination.
• Update the class to show the drop-down to select the page size.
• Replaced the class pull right/left to float right/left.

I like to do small commits with short comments to let easy to see what had done.

Thanks =)

[wenzhixin]

Thanks @alanlima, I have modified the code to support bootstrap v4.0 base your code. @chrisw73 We can use font-awesome instead. Added example: http://issues.wenzhixin.net.cn/bootstrap-table/#options/v4.html

[wenzhixin]

@monaw update to the latest version.