flow image block as single unit

This prevents each line of the image block from flowing independently,
so they will always be aligned even in the presence of floated elements.
wrap images using max-width rather than hard line breaks
remove spaces between images and only use margins to align them
Merge remote-tracking branch 'pulls/4'

Closes #4:  Html cleanup

This cleans up the html a bit. The primary motivation was to fix the alignment
in the presence of floated elements, so they image block doesn't get broken up
on MetaCPAN. It also improves the wrapping a bit to cope better with narrower
displays.
changelog for PR#4
shorter pod lists
Acme-CPANAuthors-Nonhuman-0.018

          - clean up HTML generation, for better rendering with recent changes
            to metacpan layout (Graham Knop, PR#4)