Merge pull request #5628 from elasticspoon/parallel-tests #1

Job	Run time
rspec ([0, 1, 2, 3]) / RSpec Groups [0, 1, 2, 3]	3m 42s
rspec ([4, 5, 6, 7]) / RSpec Groups [4, 5, 6, 7]	3m 39s
rspec ([8, 9, 10, 11]) / RSpec Groups [8, 9, 10, 11]	3m 35s
combine_and_report / combine_and_report	9s
	11m 5s

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