getting disk safes in cdp v4
only create devices if they are present
compact array of disk safes
Tests!
Version bump
Merge branch 'disk_safes_v4' into disk_safes

Conflicts:
	lib/ultravault/data_objects/agent.rb
	lib/ultravault/data_objects/disk_safe.rb
	lib/ultravault/soap_service/disk_safe_service.rb
	test/unit/lib/ultravault/data_objects/test_agent.rb
	ultravault.gemspec
Merge pull request #11 from melbourne/disk_safes

Disk safes