Make installations less hacky #143

Job	Run time
rspec (3.0)	32s
active_record_with_lock_adapter_rspec (3.0)	34s
rubocop	14s
rspec (3.1)	33s
smoke_test (3.0, 2.2)	39s
active_record_with_lock_adapter_rspec (3.1)	32s
smoke_test (3.0, 3.1)	37s
active_record_with_lock_adapter_rspec (3.2)	40s
rspec (3.2)	38s
smoke_test (3.1, 2.2)	34s
active_record_with_lock_adapter_rspec (3.3)	34s
rspec (3.3)	38s
smoke_test (3.1, 3.1)	36s
smoke_test (3.2, 2.2)	32s
smoke_test (3.2, 3.1)	38s
smoke_test (3.3, 2.2)	43s
smoke_test (3.3, 3.1)	36s
	9m 50s

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