Improve press release / blog post design

[tbekolay]

There's nothing specifically wrong with them right now, but if we start to publish (or want to publish) more press releases or blog posts, we should improve the design and typography on those pages. A few things that might be helpful:

• Better handling of long titles (perhaps different behavior depending on title length?)
• Convenience CSS classes for images (sometimes annoying to have them laid out well inline or wrapped around text or as a separate block)
• Ability to export an IPython notebook to markdown and have it render well on the site
• Better styling for:
  • Blockquotes
  • Code blocks
  • Inline code

It might be the case that press releases and blog posts have different layouts, or both collections make use of multiple different layouts depending on the type of content.