Article: Condense all of CardStack & MainStack into one screen for desktop view

[worldviewer]

• [x] Set up screen width in Redux and create a resize handler in MainStack to update it. I should send the pixel width to Redux and calculate isDesktop, isMobile and isTablet based upon that.
• [x] Copy code that calculates deep zoom parameters based upon screen size from Card component into desktop version of MainStack, so that it can be applied to the feed post images.
• [x] The background will act as the deep zoom canvas.
• [x] The entire CardStack/MainStack should condense into one single screen. Try to use all MobiScroll components where necessary, and keep the mobile component code separated from the desktop code as much as possible.
• [x] Feed posts on right should be somewhere between 300 and 450 pixels wide, and titles should always appear beneath. In other words, just one wide, stacked vertically.
• [x] FeedCard: A left panel can slide right to show the associated text.
• [x] FeedCard: A right panel can slide left to show the associated feed (it can be vertical).
• [x] CardStack: A left panel can slide right to show the associated text.
• [x] There should be a desktop-specific way to move vertically through the MainStack. Probably the best idea for this is to just use the mobile overlay, but keep it on the screen at all times (and keep it clickable).
• [x] When there are no feed posts for a particular card, there should be a logo which unmistakably represents the Controversies of Science G+ collection. The user can click this to visit the original collection post and comments for that card.
• [x] There needs to be something displayed in place of the deep zoom background when a card's feed has no content beyond the card content. The best option would be to place a description of of what sort of content should go there.

I will keep the search and the informational pages the same for both mobile and desktop.

[worldviewer]

react-sliding-pane here looks like a reasonable choice for condensing the CardStack component. I will have to implement this for both the CardStack and FeedCard components. I should get it working in one, then apply it to the other.