it's safer to use pkg_add than pkgin

Because 'pkgin' can't 'know' about more than one upstream repo at once, it's dangerous to have multiple repos in repositories.conf

I've thus swapped out pkgin logic in favor of directly adding the pkg via pkg_add and a URL.

The part of this that I'm not too excited about is the html parsing that I'm doing - if you guys can think of a better way, let's do that?