Add pip, coverage and reorder Dockerfile

Dockerfile

@@ -1,16 +1,25 @@
+# USAGE
+# 1. Build new Docker container:
+# > docker build -t ocropy -f Dockerfile .
+# 2. Run this Docker container:
+# > docker run -it --rm -v ${PWD}:/ocropy ocropy bash
+# 3. Run tests:
+# ># ./run-test
+
 FROM ubuntu:16.04
-MAINTAINER Konstantin Baierer <konstantin.baierer@gmail.com>
+MAINTAINER Philipp Zumstein
 ENV DEBIAN_FRONTEND noninteractive
 ENV PYTHONIOENCODING utf8
 
 WORKDIR /ocropy
+COPY PACKAGES .
 RUN apt-get update && \
     apt-get -y install --no-install-recommends git ca-certificates wget unzip && \
+    apt-get install -y python-pip $(cat PACKAGES) && \
     git clone --depth 1 'https://github.com/kba/ocr-models-client' /ocr-models-client && \
-    /ocr-models-client/ocr-models download -d models 'ocropy/en-default' 'ocropy/fraktur'
-COPY PACKAGES .
-RUN apt-get install -y $(cat PACKAGES)
-COPY . .
-RUN python setup.py install && \
+    /ocr-models-client/ocr-models download -d models 'ocropy/en-default' 'ocropy/fraktur' && \
+    pip install --upgrade pip coverage && \
     apt-get -y remove --purge --auto-remove git wget unzip && \
     apt-get clean && rm -rf /tmp/* /var/lib/apt/lists/* /var/tmp/*
+COPY . .
+RUN python setup.py install