add missing spinner.gif that select2 references
get rid of rvmrc, it was never being used

closes #55
back out 9ece666 removing utf8mb4 hacks, no longer needed
production is running ruby 1.9.3-p429 now
change dev database.yml to reflect utf8mb4
production is running mariadb in case anyone cares
user newer-style validation methods, add banned usernames
sort of merge cache branch but don't do anything automatically

allow manual caching of story text using diffbot, if an api key is
configured and Story#fetch_story_cache! is called
unique mailing list tokens for everyone!
use cast() magic when passing score to sphinx

fixes problem with mysql/mariadb 5.5
move comment thread_id generation to Comment
block all spiders by default, allow major ones
disable tripwire when starting sphinx
start on mailing list interface
move countinual comment logging to model

comments can come in from other places than the controller now
rss_token and mailing_list_token have to be set before create, duh
add front-end code to allow users to toggle mailing list reception
try not to re-wrap comments posted by e-mail at 72 chars
don't hardcode "Lobsters" and "lobste.rs" everywhere, use Rails.application.{name,domain}
before cramming utf8 data into us-ascii, replace "smart" quotes and things