Remove inbox and archive from the top nav
Add secondary inbox navbar
Rework the participants area
Include the conversation summary text and style it
Use the grid to position parts of a conversation row
Don't show avatars if they're not available
Retina-ify avatars
Add status icons to conversation rows
Show conversation actions on hover
Style the conversation actions
Stop subject from wrapping
Highlight conversations when hovered and expanded
Expand message row when responding
Slim up the events in the stream
Trim up the messages in the conversation stream
Restructure the conversation styles with minimal markup
Add small size for displaying a message author
Reimplement the basic view of a conversation
Implement active state for hovered conversations
Restructure conversation toggling