Sort pages by name by default

The order that files are returned differs across operating systems, so
ensure that they're being sorted after the fact.
link to Stack Overflow answer re: Dir sorting
clarify page sorting test
Merge pull request #1848 from afeld/sort-pages
Update history to reflect merge of #1848
Fix typo in docs.
Merge pull request #1854 from EricDobson/docs_datafiles_typo
Update history to reflect merge of #1854
Merge remote-tracking branch 'upstream/master' into sort-attributes
fix file sorting test