Tests

Fix the Libbz2::finalizer method. #7

Job	Run time
test (ubuntu, 2.4)	29s
test (ubuntu, 2.5)	26s
test (ubuntu, 2.6)	25s
test (ubuntu, 2.7)	26s
test (ubuntu, 3.0)	12s
test (ubuntu, 3.1)	18s
test (ubuntu, 3.2)	12s
test (ubuntu, 3.3)	27s
test (ubuntu, 3.4)	24s
test (ubuntu, head)	8s
test (ubuntu, jruby)	53s
test (ubuntu, jruby-head)	51s
test (ubuntu, truffleruby)	24s
test (ubuntu, truffleruby-head)	29s
test (macos, 2.6)	31s
test (windows, 2.4.10)	2m 31s
finish	5s
	9m 11s

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