Paging based on 'continue' links

[hempels]

Commit 154a8bc8fd15debff0165093b34666af6fad753f adds logic in paging heuristic for heavy weighting on the word "continue".

All existing tests pass, new passing test added to cover that scenario. Example article from http://www.ilr.cornell.edu/trianglefire/story/introduction.html.

Ignore the other commits in this Pull Request, they've all been submitted/reviewed previously.