Fix issue #3 and generally update project

Dockerfile

@@ -1,18 +1,17 @@
-# version 0.0.1
-# docker-version 0.6.6
+# version 0.0.2
+# docker-version 0.7.6
 FROM        ubuntu:12.04
 MAINTAINER  Jim Myhrberg "contact@jimeh.me"
 
-# Make sure the package repository is up to date.
-RUN         echo "deb http://archive.ubuntu.com/ubuntu precise-backports universe" >> /etc/apt/sources.list
-RUN         apt-get update
-
-# Let's do this...
-RUN         apt-get install -y znc/precise-backports znc-dbg/precise-backports znc-dev/precise-backports znc-extra/precise-backports znc-perl/precise-backports znc-python/precise-backports znc-tcl/precise-backports && apt-get clean
+# We use a bootstrap script to avoid having temporary cache files and build
+# dependencies being committed and included into the docker image.
+ADD         bootstrap.sh /tmp/
+RUN         chmod +x /tmp/bootstrap.sh && /tmp/bootstrap.sh
 
 RUN         useradd znc
 ADD         start-znc /usr/local/bin/
 ADD         znc.conf.default /src/
+RUN         chmod 644 /src/znc.conf.default
 
 USER        znc
 EXPOSE      6667

Makefile

@@ -0,0 +1,7 @@
+build:
+	docker build -t ${USER}/znc .
+
+push: build
+	docker push ${USER}/znc
+
+.PHONY: default

bootstrap.sh

@@ -0,0 +1,14 @@
+#! /usr/bin/env bash
+
+# Install
+apt-get install -y python-software-properties
+add-apt-repository ppa:teward/znc
+apt-get update
+apt-get install -y znc znc-dbg znc-dev znc-perl znc-python znc-tcl
+apt-get install -y znc znc-dbg znc-dev znc-extra znc-perl znc-python znc-tcl
+
+
+# Clean up
+apt-get remove -y python-software-properties
+apt-get autoremove -y
+apt-get clean