Dockerize tests for easy reproduction.

.dockerignore

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+*.swp
+.git/
+.gitignore
+.travis.yml
+CHANGELOG.md
+Dockerfile
+LICENSE
+README.md
+bash-powerline-screenshot.png

Dockerfile

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+FROM python:2.7-alpine
+
+MAINTAINER github.com/banga/powerline-shell
+
+ENV USER docker
+ENV USERNAME "Docker User"
+
+# Create a 'docker' user because we might not want to run everything as 'root'. Use 9999 as the ID
+# to keep it specific and away from the IDs in the host system.
+RUN addgroup -g 9999 $USER && \
+    adduser -u 9999 -G $USER -g "$USERNAME" -s /bin/bash -D $USER
+
+RUN apk add --no-cache --update \
+      bzr \
+      fossil \
+      git \
+      mercurial \
+      php5 \
+      subversion && \
+    rm -rf /var/cache/apk/*
+
+RUN mkdir -p /usr/src/app
+WORKDIR /usr/src/app
+
+# Cache the dev requirements.
+COPY requirements-dev.txt .
+RUN pip install -r requirements-dev.txt
+
+USER docker
+RUN bzr whoami "$USERNAME <$USER@example.com>" && \
+    git config --global user.email "$USER@example.com" && \
+    git config --global user.name "$USERNAME"
+
+COPY . ./
+USER root
+RUN chown -R docker:docker .
+
+USER docker
+RUN nosetests