Revert "Explicitly ignore rel='download' links while looking for html pages."

This reverts commit 0bb9c31aeab89eba17de26802e6b01c9cafeeb39.
Revert "Test HTMLPage link filter by rel attribute."

This reverts commit 4dceb6ce870bf02698dee137a187d81932f38ad2.
Revert "Update method description to match expected behaviour."

This reverts commit 6a483a3778fb6ebe7b7e7557e32383ba78d4801e.
Bumped version to 1.3.1.