[bandcamp_covers] Initial version, supports manual single-file upload
Improve help screens
[bandcamp_covers] Add automatic uploading. No error handling still
[bandcamp_covers] Skip over BC albums with no cover art
[bandcamp_covers] Handle and ignore 404 errors on Bandcamp
[bandcamp_covers] Exclude releases that have multiple different URLs
[editing] Use integer division
[editing] Use imghdr to detect image type, extension may be unreliable

Per request from nikki: "bandcamp definitely has had pngs in past
sometimes with a .jpg extention"
[bandcamp_covers] Also handle DNS errors (urllib2.URLError)