Lightbox title set then overwritten fix.
Merge branch 'release-2.3'
Expanded tests.
Remove unnecessary hideinlightbox classes.
Merge branch 'release-2.3'
Header conversion.
Merge branch 'release-2.3'
Added tests.
More test coverage.
Fixed inaccurate doc comments.
Don't bother measuring code coverage of factories -- they're just glue.
Improved coverage.
Baseline plugin manager tests.