iqdb: update API client to use new version of IQDB.

Replace the old IQDB API client with a new client for the new forked
version of IQDB at https://github.com/danbooru/iqdb.

Changes:

* The /iqdb_queries endpoint now returns `hash` and `signature` fields.
  The `signature` is the full decoded Haar signature, while the `hash`
  is a encoded version of the signature.
* The /iqdb_queries endpoint no longer returns `width` and `height`
  fields in the response (these were always 128x128).
* We no longer need the IQDBs frontend server, now we talk to the IQDB
  instance directly.
* We no longer send add/remove image commands to IQDB through AWS SQS,
  now we send them to IQDB directly. They are sent in a delayed job so
  that if IQDB is down, uploading images is still possible, the add
  image commands will just get queued up.
* Fix a bug where regenerating an image's thumbnails didn't regenerate
  IQDB, because IQDB silently ignored add image commands when the image
  already existed in the database.

Procfile

@@ -1,5 +1,2 @@
 unicorn: bin/rails server -p 3000
-jobs: bin/rake jobs:work
-recommender: bundle exec ruby script/mock_services/recommender.rb
-iqdbs: bundle exec ruby script/mock_services/iqdbs.rb
-reportbooru: bundle exec ruby script/mock_services/reportbooru.rb
+jobs: bin/rake jobs:work