need support for scroll

[chongshengdz]

Manticore Search 7.0.0 supports scroll, but manticosearch-php is not

[Nick-S-2018]

manticoresearch-php supports it too. You can set the scroll option just as other search options, like cutoff, etc.
We're going to update the corresponding section of documentation to include information about scroll.

[chongshengdz]

yes, but it doesn't include information about scroll in search results.
so please update it ASAP.

[Nick-S-2018]

@sanikolaev pls, review #234 that fixes the issue

[Nick-S-2018]

Fixed in #234