Lao Language support

[sam-lex]

Hello, thanks for this awesome lib.
Would you be interested in adding support for Lao language? (p.s.: "milliseconds" seems to be non-existent in Laotian)

var languages = {
  lo: {
    y: 'ປີ',
    mo: 'ເດືອນ',
    w: 'ອາທິດ',
    d: 'ມື້',
    h: 'ຊົ່ວໂມງ',
    m: 'ນາທີ',
    s: 'ວິນາທີ',
    ms: function (c) { return 'millisecond' + (c === 1 ? '' : 's') },
    decimal: ','
  }
}

Translation credits to: Malikoun

Right now I'm just using a custom humanizer with it defined, and works great. I can provide a PR next week or so if you want.

[EvanHahn]

A PR would be great!