Akismet checker is using 127.0.0.1, not the real IP
GitLab.com is checking spammers against 127.0.0.1, not the real IP. In `api/issues.rb`, `env['REMOTE_ADDR']` is being used. Do we need to use something like this?
```ruby
request.env['HTTP_X_FORWARDED_FOR'] || request.remote_ip
```
/cc: @twk3
issue