Add 1x1.gif
.frogrc changes:

- Add decorate-feed-uris? and feed-image-bugs? parameters that control
  the features added in commit 7c0ed36a

- Add maybe-bool which changes "true" and "false" to #t and #f. This
  way, on/off params can be set a specific way, as opposed to relying
  on the default being on and commenting them out to turn them off.