Implement column reordering

[stutrek]

This adds support for drag and drop column reordering, adds and example, and updates the docs. It is used just like column resizing, with a onColumnReorderEndCallback passed as a prop to the table.

• http://stutrek.github.io/fixed-data-table/example-reorder.html
• https://github.com/stutrek/fixed-data-table/blob/master/examples/ReorderExample.js#L58-L71

note: I am ignoring the directive not to edit the dist folder because I actually need to use this.

If you're trying to use this you can include it the normal npm way and add this to your webpack config:

  alias: {
    'fixed-data-table$': __dirname + '/node_modules/fixed-data-table/dist/fixed-data-table'
  }

[JMacLulich]

This is great, thanks @stutrek exactly what I was looking for, is there any chance this PR can make it into master?

[stutrek]

@JMacLulich I think you're going to want this branch, it's much better. I haven't had time to close this PR and make a new one yet.

https://github.com/stutrek/fixed-data-table/tree/f/better-reorder

[KamranAsif]

@wcjordan can we get a ticket to bring over these commits?

[stutrek]

I just rebased

[zpao]

Thanks for your pull request. I apologize for leaving this project in limbo and not addressing your concerns. I have archived this project after doing a final release to make it compatible with React v16.