README: updated with links, travis build icon

README.md

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+[![Build Status](https://travis-ci.org/behance/docker-base.svg?branch=master)](https://travis-ci.org/behance/docker-base)  
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 # docker-base
----
 
-Integrates S6 process supervisor for a boot process, signal coordination, and zombie reaping (as PID 1)
-@see https://github.com/just-containers/s6-overlay
+https://hub.docker.com/r/behance/docker-base/tags/
+
+Ubuntu used by default, Alpine builds also available tagged as `-alpine`  
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+Provides base OS, patches and stable nginx for quick and easy spinup.  
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+[S6](https://github.com/just-containers/s6-overlay) process supervisor is used for `only` for zombie reaping (as PID 1), boot coordination, and termination signal translation  
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+[Goss](https://github.com/aelsabbahy/goss) is used for build-time testing  
 
 ### Expectations