Re-render is broken when pagination is on but no currentPage is specified

[slestang]

The PR #272 seems to have broken the refresh of a Table without a currentPage set.
On re-render, I get the error:

Must pass a currentPage argument to Paginator

If I set currentPage={0} on Table the error disappear.
It was working with version 0.13.0

What I understood:
When componentWillReceiveProps is called, currentPage is null, so updateCurrentPage is called with null:

updateCurrentPage(nextPage) {
    if (nextPage !== this.state.currentPage) { // null !== 0
        this.setState({ currentPage: nextPage});
    }
}

So currentPage is setted with null in the state and the error is thrown by Paginator.

[glittershark]

Thanks for digging into this.