Add .circleci/config.yml #421

Job	Run time
Build docker image for 12-3.4 variant default	57s
Build docker image for 12-3.4 variant alpine	4m 3s
Build docker image for 13-3.4 variant default	1m 13s
Build docker image for 13-3.4 variant alpine	4m 44s
Build docker image for 14-3.4 variant default	58s
Build docker image for 14-3.4 variant alpine	4m 33s
Build docker image for 15-3.4 variant default	57s
Build docker image for 15-3.4 variant alpine	4m 16s
Build docker image for 16rc1-3.4 variant default	58s
Build docker image for 16rc1-3.4 variant alpine	5m 0s
Build docker image for 14-master variant default	33m 19s
Build docker image for 15-master variant default	33m 41s
Build docker image for 16rc1-master variant default	46m 31s
Build docker image for 11-3.3 variant default	1m 6s
Build docker image for 11-3.3 variant alpine	3m 56s
	2h 26m 12s

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