Flattened RUN statements into a single one.

Dockerfile

@@ -8,17 +8,21 @@
 FROM dockerfile/ubuntu
 
 # Install Redis.
-RUN cd /tmp && wget http://download.redis.io/redis-stable.tar.gz
-RUN cd /tmp && tar xvzf redis-stable.tar.gz
-RUN cd /tmp/redis-stable && make && make install
-RUN cp -f /tmp/redis-stable/src/redis-sentinel /usr/local/bin
-RUN mkdir -p /etc/redis
-RUN cp -f /tmp/redis-stable/*.conf /etc/redis
-RUN rm -rf /tmp/redis-stable*
-RUN sed -i 's/^\(bind .*\)$/# \1/' /etc/redis/redis.conf
-RUN sed -i 's/^\(daemonize .*\)$/# \1/' /etc/redis/redis.conf
-RUN sed -i 's/^\(dir .*\)$/# \1\ndir \/data/' /etc/redis/redis.conf
-RUN sed -i 's/^\(logfile .*\)$/# \1/' /etc/redis/redis.conf
+RUN \
+  cd /tmp && \
+  wget http://download.redis.io/redis-stable.tar.gz && \
+  tar xvzf redis-stable.tar.gz && \
+  cd redis-stable && \
+  make && \
+  make install && \
+  cp -f src/redis-sentinel /usr/local/bin && \
+  mkdir -p /etc/redis && \
+  cp -f *.conf /etc/redis && \
+  rm -rf /tmp/redis-stable* && \
+  sed -i 's/^\(bind .*\)$/# \1/' /etc/redis/redis.conf && \
+  sed -i 's/^\(daemonize .*\)$/# \1/' /etc/redis/redis.conf && \
+  sed -i 's/^\(dir .*\)$/# \1\ndir \/data/' /etc/redis/redis.conf && \
+  sed -i 's/^\(logfile .*\)$/# \1/' /etc/redis/redis.conf
 
 # Define mountable directories.
 VOLUME ["/data"]