Issues with S3 and new version of Paperclip validations

So I tried to deploy this last night to heroku and use S3 for storage but I was blocked by the Missing validation due to the upgrade to Paperclip ~4.1.0 which strongly restricts you to having to include explicit content type and file extension information to your application.

For the moment I have this patch with includes the validation for S3 and then skips validation so you can still upload whatever you want. The alternative is to rollback the Paperclip gem to ~3.5.4 which I am currently doing in production.

Commit Info
#### Not checking validations on attachments save for paperclip 4.0

- In the new version of paperclip content spoofing validation interferes with uploading whatever you want
- Additionally added I18n translation and call to required paperclip validation
- Adding arel and tzinfo because they were expected to resolve some dependency