* Added CommonMark-based post rendering
* Fixed text wrapping in most block elements
* Fixed paragraphs not being rendered as children of lists
* Replaced markdown images with a placeholder
* Fixed font colour in code spans
* Updated post rendering in center channel to include dates, display names, themeing, profile pictures, and threads
* Added status to ProfilePicture component
* Changed MemberListRow to use a ProfilePicture
* Removed unused prop
* Fixed incorrect copyright year on new file
* Removed unnecessary ref
* Fixed copyright date
* Removed unnecessary components folder from channel scene
* Added initial version of post textbox
* Moved getTheme into a proper selector
* Moved ChannelHeader into its own component
* Flipped post list so that the most recent posts appear at the bottom
* Moved post textbox value into redux view store
* Switched new components from PureRenderMixin to React.PureComponent
