Enable filtering by birth year

[alulsh]

Currently, you can filter map marker results by geocoding relevance. We should add a similar filter for birth year.

After parsing the family tree, we can grab the earliest year and latest year for the start and end values of the range. A user should be able to select two values - a start year and an end year.

Since the HTML5 range input only supports one value, we can use either noUiSlider or jQuery UI range slider.

We can add a custom data attribute called data-year for the filtering or reuse the Unix timestamp from #3.