Added images in categories to img directory

10 images in each category subdirectory: freedom, order, natural,
loyalty, justice, truth, equality, hope, security, value. Plus some
minor changes to JS to test out some images.
Removed temporary images from img directory
Added all images to HTML and some temporary arrays to JS
Added arrays of all images to revol.js
Randomly selects appropriate winning image for category

Therefore changed names of arrays of images and wrapped all arrays in
theGhosts object.
Merge branch 'with-images'