Add makisu example (#139)

makisu/Dockerfile

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+FROM ubuntu
+
+RUN apt-get update -y
+RUN apt-get install -y ca-certificates #!COMMIT

makisu/README.md

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+# Makisu
+
+This directory contains an example of using [Uber's Makisu
+tool](https://github.com/uber/makisu) to produce Docker images in
+Google Cloud Build.

makisu/cloudbuild.yaml

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+steps:
+- name: gcr.io/makisu-project/makisu:v0.1.0
+  args: ['build', '--load', '--modifyfs=true', '-t', 'gcr.io/$PROJECT_ID/built-with-makisu', '--commit=explicit', '.']
+
+# TODO: Instead of building with --load into the Docker daemon
+# then pushing, use --push=gcr.io which will push directly to the
+# registry and bypass the Docker daemon. Unfortunately, this seems
+# to not work with Google's Application Default Credentials.
+
+images:
+- gcr.io/$PROJECT_ID/built-with-makisu