Support building in Dockerfile dir#49

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anthony-o wants to merge 3 commits intomakeusabrew:masterfrom

anthony-o:feat/buildindir

Commits on Aug 20, 2014

Build parent images checking the Dockerfile directive. Fixes #1
anthony-o
committed

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
committed
Support building in Dockerfile dir
anthony-o
committed