Integration tests for virus scanning (pending)
Simple VirusScanner class wrapping ClamAV
Fallback to Rails.root if GOVUK_APP_ROOT is unset
Added scan_for_viruses method, and state machine to Asset
Add database_cleaner
Add timestamps to Asset model
Schedule a virus scan after Asset save.
Remove media serving redirect as it's not being used.
Fix bug in media serving controller.

Wasn't 404ing with invalid filename.
Also refactored tests.
Only serve files that have been scanned and found clean
Expose asset state in API
Simplify VirusScanner exception handling

No need to rescue System Call errors, these can just propogate upwards.
Add exception_notifications around virus scanning
Remove cruft that got committed by mistake
Merge pull request #13 from alphagov/virus_scanning

Virus scanning