Merge pull request #383 from northwoodspd/virtual_properties #191

Job	Run time
test-ubuntu-ruby (ruby-head, 11-3.0)	3m 2s
test-ubuntu-ruby (ruby-head, 12-master)	3m 5s
test-ubuntu-ruby (ruby-head, 13-master)	2m 52s
test-ubuntu-ruby (ruby-head, 14-master)	2m 35s
test-ubuntu-ruby (ruby-head, 15-master)	2m 33s
test-ubuntu-ruby (3.2, 11-3.0)	1m 22s
test-ubuntu-ruby (3.2, 12-master)	3m 37s
test-ubuntu-ruby (3.2, 13-master)	1m 11s
test-ubuntu-ruby (3.2, 14-master)	1m 11s
test-ubuntu-ruby (3.2, 15-master)	1m 11s
test-ubuntu-ruby (3.1, 11-3.0)	1m 38s
test-ubuntu-ruby (3.1, 12-master)	1m 47s
test-ubuntu-ruby (3.1, 13-master)	1m 28s
test-ubuntu-ruby (3.1, 14-master)	2m 2s
test-ubuntu-ruby (3.1, 15-master)	1m 32s
test-ubuntu-ruby (3.0, 11-3.0)	1m 59s
test-ubuntu-ruby (3.0, 12-master)	1m 35s
test-ubuntu-ruby (3.0, 13-master)	2m 0s
test-ubuntu-ruby (3.0, 14-master)	1m 39s
test-ubuntu-ruby (3.0, 15-master)	1m 37s
	39m 56s

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