test

Add CONTRIBUTING.md and trim README #355

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Run time

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Job	Run time
build (3.3)	1m 54s
build (4.0)	1m 48s
build (3.4)	1m 59s
build (jruby-10.1.0.0)	2m 25s
build (3.2)	2m 3s
	10m 9s