JSON to div conversion

Used JSON to put each asteroid (and its details) in a separate div.
Added coordinates

Mapped the divs to the parent div using x and y coordinates from xPos
and yPos in the JSON
Clean-up

cleaned up some code.
Documentation

Added some documentation to individual files
Asteroid png files
Styling and animations

Added images, colors, and styles to elements, fixed popovers, added
keyframes and css animations/transitions
Fixed some things
Merge branch 'master' into storytelling-real