Add test showing merge paragraph assert with some exotic odf elements
Allow merge paragraph to handle unexpected nodes near paragraph boundaries

getTextElements may return some unexpected text nodes if the step filters
haven't correctly identified the first/last step in the paragraph. Rather
than failing completely in this case, simply log the unexpected items and
skip them.

getTextElements itself still needs to be fixed in these cases, but the
harm caused by such mistakes is slightly reduced in this instance.
Merge pull request #771 from peitschie/merge-p-fields

Allow merge paragraph to handle unexpected nodes near paragraph boundaries
Add test demonstrating foreign elements are discarded on paragraph merge
Fix preservation of foreign elements on paragraph merge

This behaviour was working prior to the merge paragraph operation being
introduced. A new edge case was introduced related to cleaning up empty
spans that caused this to regress.
Merge pull request #770 from peitschie/merge-p-save-children

Fix preservation of foreign elements on paragraph merge
Avoid FF vs Chrome font size rounding differences

Choosing a point size that maps exactly to a pixel size avoids
differences between how FF and Chrome round font sizes. FF performs no
rounding, while Chrome rounds to the closest pixel.
Allow multiple accepted values in LayoutTests

Cope with cross-browser differences by allowing multiple possibly value
matches.
LayoutTests cleanup: use Object.keys array for key iteration
Add fixed line-height to ensure consistent cross-browser behaviour