Allow selection of empty lists by making editinfo elements inline blocks

Elements that are simply display:inline, but have no visible content can
do strange things to the browser selections in Chrome. They will actually
stop other preceding nodes in the same container from being selectable,
instead causing the selection to climb to the parent container.

Fixes issue #30
Merge pull request #374 from peitschie/empty-list-chrome

Allow selection of empty lists by making editinfo elements inline blocks