v1.19.0: add SOUP.setInterval() for slightly smarter polling
v1.19.1: +mse169225
v1.19.2: hook WebSocket.onmessage() to avoid chat polling
v1.19.3: tweak websocket hack code; still broken on Chrome :(
better changelog entry for v1.19.3
v1.19.4: add aviation and puzzling to list of mathjax-enabled sites
v1.19.5: finally got websocket hack working on chrome too
v1.19.6: -mse104184
v1.19.7: +mse266852
v1.19.8: less verbose websocket hack logging
release v1.19.8 as v1.20.0