Make the field-names look better.

Why can't I get rid of the space following field names?
Add the whitespace:nowrap property to field names.

Often the trailing ':' following a field name (like 'Parameters :' or 'Traits :') would get wrapped to the next line, and it looked terrible.
Merge pull request #87 from bgrant/fix-field-name-appearance

DOC: Improve field-name appearance