Allow the newer/older entries paging controls on blogs to be hidden

[Kishi85]

This is useful if you just want to show the top n posts of a blog on a page.

Example: This is used on www.binary-kitchen.de to just give a top 2 post overview of the kitchen log on the start page without giving the user the option to display older posts as those are available on a separate page.

[michitux]

Is "pager" really the correct name? I think "paginator" would be better, see e.g. https://jekyllrb.com/docs/pagination/. Apart from that this looks good.

[Kishi85]

Is "pager" really the correct name? I think "paginator" would be better, see e.g. https://jekyllrb.com/docs/pagination/. Apart from that this looks good.

I was assuming the naming scheme applied by Bootstrap for pagination and pager which differences both terms the following way:

• Pagination: Provide pagination links for your site or app with the multi-page pagination component (https://getbootstrap.com/docs/3.3/components/#pagination)
• Pager: Quick previous and next links for simple pagination implementations (or older/newer like in this case, see also https://getbootstrap.com/docs/3.3/components/#pagination-pager)

Following this definition "pager" seems to be the correct choice.

[Kishi85]

I've rebased the pull request and changed the flag parsing (the if/else was an oversight on my side and is now corrected). I've also change the flag name to 'nopagingcontrols' to avoid any ambiguity and describe directly what the flag does.