Tiny whitespace change.
Fix linking between pagination pages.

Jekyll now offers a 2 new attributes to its paginator:
  - next_page_path
  - previous_page_path

Instead of just returning the page _number_, these return the full path to the next
or previous path. :yey: for convenience!
Merge pull request #1312 from imathis/fixes/2.5

Tiny fixes for 2.5