Merge tag '1.0.12' into develop

Ensure `get_page` returns None instead of 404
ensure everything works when language is not_analyzed
Merge pull request #58 from praekelt/feature/issue-58-dont-use-`.lower()`-since-filter-is-case-sensitive

dont use `.lower()` since filter is case sensitive
version bump
Merge branch 'release/1.0.13'