Removes deprecated lifecyle method componentWillReceiveProps

[jimnanney]

This pull request removes the componentWillReceiveProps deprecated lifecycle method and moves the computes items into the render method. I stored previous prop values that would trigger recomputing on the class and only recompute if they differ.

Addresses [#50]

[gdonald]

Can someone please look at this? Thanks!

[benrhere]

If this works properly, this looks like it would be a more complete fix than what was in https://github.com/moroshko/react-autosuggest/pull/681 .