Cache Rules in AbstractInterpreter #702

Job	Run time
Performance (hand_written)	14m 41s
Performance (derived)	8m 26s
basic	8m 7s
rrules	6m 46s
integration_testing/misc	24m 6s
integration_testing/diff_tests	9m 12s
integration_testing/distributions	9m 7s
integration_testing/gp	16m 10s
integration_testing/special_functions	1m 23s
integration_testing/array	19m 14s
integration_testing/turing	7m 53s
	2h 5m 5s

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