Changed covers to spines (+ colors!)

Since the Discogs API won't allow me to load the covers of everything
(there is a 1000 request/day limit), I changed the 'records' to
'spines'. They now say the artist & title, and are arranged as little
narrow bars (like record spines) which are colored randomly via a JS
function. Added jQuery to increase size on mouseover. Next up, make it
all in one row, add scrolling functionality, and display extended
information on click.