PullMark 0.28.0-beta.2

• Margin-note and review-comment bubbles in the margin rail now stay
  clear of the overlay scrollbar when the web view is narrow (sidebar
  and outline open) — first beta feedback, thanks!
• Sideways trackpad swipes no longer rubber-band the page: documents
  never scroll horizontally by design (wide code blocks and tables
  scroll within themselves), so the page now says so.