resolves #73: it's now much easier to do functional testing via docker

Dockerfile

@@ -16,12 +16,17 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     python-pip \
     python3-pip \
     libfreetype6-dev \
+    python-numpy \
+    python3-numpy \
     python3-matplotlib \
     libfreetype6-dev \
     libpng-dev \
     libjpeg-dev \
     pkg-config \
     python3-skimage \
+    tk \
+    tk-dev \
+    python3-tk \
  && pip3 install -U cython \
     scikit-image \
  && rm -rf /var/lib/apt/lists/*

Makefile

@@ -5,8 +5,8 @@ info:
 	@echo "Available Make Commands"
 	@echo ""
 	@echo "build:	builds the image"
-	@echo "py2:	mounts ~/Documents/nd2s to /var/nd2s and runs a Python 2.7 interpreter"
-	@echo "py3:	mounts ~/Documents/nd2s to /var/nd2s and runs a Python 3.4 interpreter"
+	@echo "py2:	maps ~/Documents/nd2s to /var/nd2s and runs a Python 2.7 interpreter"
+	@echo "py3:	maps ~/Documents/nd2s to /var/nd2s and runs a Python 3.4 interpreter"
 	@echo "test:	runs all unit tests (in Python 3.4)"
 	@echo ""
 
@@ -14,13 +14,13 @@ build:
 	docker build -t jimrybarski/nd2reader .
 
 shell:
-	docker run --rm -v ~/Documents/nd2s:/var/nd2s -it jimrybarski/nd2reader bash
+	xhost local:root; docker run --rm -v ~/Documents/nd2s:/var/nd2s -v /tmp/.X11-unix:/tmp/.X11-unix -e DISPLAY=unix$(DISPLAY) -it jimrybarski/nd2reader bash
 
 py2:
-	docker run --rm -v ~/Documents/nd2s:/var/nd2s -it jimrybarski/nd2reader python2.7
+	xhost local:root; docker run --rm -v ~/Documents/nd2s:/var/nd2s -v /tmp/.X11-unix:/tmp/.X11-unix -e DISPLAY=unix$(DISPLAY) -it jimrybarski/nd2reader python2.7
 
 py3:
-	docker run --rm -v ~/Documents/nd2s:/var/nd2s -it jimrybarski/nd2reader python3.4
+	xhost local:root; docker run --rm -v ~/Documents/nd2s:/var/nd2s -v /tmp/.X11-unix:/tmp/.X11-unix -e DISPLAY=unix$(DISPLAY) -it jimrybarski/nd2reader python3.4
 
 test:	build
 	docker run --rm -it jimrybarski/nd2reader python3.4 /opt/nd2reader/tests.py