Java CI with Maven

Bump hadoop from 0.20.2-cdh3u4 to 3.4.0 and mark optional #14

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Run time

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Job	Run time
build (8)	1m 14s
build (11)	3m 24s
build (17)	1m 15s
build (21)	1m 13s
build (22)	1m 23s
	8m 29s