natural sorting for isotope

[micred]

Sorting for isotope is by lexicographic order.
This can be odd. Elements ['1_file', '2_file', '20_file'] are sorted in this way:
1_file
20_file
2_file

With this pull request user can be enable natural sorting, i.e.:
1_file
2_file
20_file

Credits: https://github.com/overset/javascript-natural-sort/

Configure:

$element.isotope({
    sortBy : sortName,
    sortAscending: true,
    naturalSorting : true
});

[desandro]

Thank you for your contribution! 🚀 👄 This looks to be a solid feature that Isotope could use. For now, I'm going to keep it un-merged and wait for others to chime in.

This branch is against master, which is soon to be obsolete. Once v2 is merged in, you may want to revisit this.

[micred]

No problem, I can rework this little patch to v2 branch if you find it useful. Is up to you.

[desandro]

Closing up this open PR. Thanks again for your contribution!