* Update mattermost-redux
* Tap on Deleted post to remove it
* Improvements when rendering post additional content
* Avoid unnecessary re-renders on the post list component
* Avoid unnecessary re-renders on the channel post list component
* Avoid unnecessary re-renders on the channel screen
* Feedback review
* 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