Build parent images checking the Dockerfile directive#48

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anthony-o wants to merge 2 commits intomakeusabrew:masterfrom

anthony-o:feat/builddep

Commits on Aug 20, 2014

Build parent images checking the Dockerfile directive. Fixes #1
anthony-o
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Commits on Aug 21, 2014

When building image, detect build errors sent by Docker and display them. Also cancel the build chain in case of building dependencies. Inspired by https://github.com/Runnable/docker-image-builder/…
anthony-o
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