0.12.3

• URL query parameters are now sanitized for sensitive data [pcorliss, #275]
• Raven::Client can now use a proxy server when sending events to Sentry [dcramer, #277]
• Raven::Client will now use a timed backoff strategy if the server fails [codekitchen, #267]
• Automatic integration loading is now a lot less brittle [dcramer, handlers, #263, #264]
• Fixed some issues with prefixes and DSN strings [nateberkopec, #259]
• If Raven is initialized without a server config, it will no longer send events [nateberkopec, #258]
• Slightly nicer credit-card-like number scrubbing [nateberkopec, #254]
• Fix some exceptions not being caught by Sidekiq middleware [nateberkopec, #251]
• Uncommon types are now encoded correctly [nateberkopec, #249]