Fix/locale polyfill

[grimzy]

#121 with symfony/polyfill-intl-icu instead of just ext-intl.

---

I'm not sure about this code added to the Point class:

private function rtrimCoordinate($coordinate) {
    return rtrim(rtrim($coordinate, '0'), '.,');
}

[gpedro]

wow! nice job :P

[grimzy]

Anyone knows how to remove intl extension from PHP on Travis?
https://travis-ci.org/grimzy/laravel-mysql-spatial/jobs/659959223#L710 doesn't work.