Reliable paged comments

This commit uses FQL to get very reliable
comment system, where you can load pages
of comments and be sure that this will work.

One only bug is that if your number of comments
is multiple of ten, then the "load previous"
button is displayed even if there are no more
comments.
Allow likes page to link to anything

Likes page might contain pages, so we need
to solve the type to load instead of loading
it directly.