Adds clamav scan to cloud_resource in generic_file_actor.

Integrates browse_everything and clamav for curate_uc app.

Modifies generic_file_controller and generic_works_controller.
Modifies generic_file_actor and generic_works_actor.
Modifies spec test to account for differnet rendering option
on virus discovery.
Merge pull request #5 from uclibs/feature/browse_everything_clamav

Adds clamav scan to browse_everything resources.