Merge pull request #240 from stronk7/reduce_travis_testing #476

Job	Run time
Code coverage (codecov)	25s
CI test (make validate)	35s
Integration tests (8.2, master)	6m 26s
Integration tests (8.2, MOODLE_402_STABLE)	6m 6s
Integration tests (8.1, MOODLE_401_STABLE)	7m 7s
Integration tests (8.0, MOODLE_400_STABLE)	7m 10s
Integration tests (8.0, MOODLE_311_STABLE)	8m 33s
Integration tests (7.4, MOODLE_310_STABLE)	6m 54s
Integration tests (7.4, MOODLE_39_STABLE)	5m 56s
Integration tests (7.4, MOODLE_38_STABLE)	8m 30s
	57m 42s

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