update to latest resin.io standards

Dockerfile.template

@@ -1,15 +1,21 @@
-FROM resin/%%RESIN_MACHINE_NAME%%-debian
-
-#switch on systemd init system in container
-ENV INITSYSTEM on
+FROM resin/%%RESIN_MACHINE_NAME%%-debian:jessie
 
+# Install build tools and remove layer cache afterwards
 RUN apt-get -q update && apt-get install -yq --no-install-recommends \
 	build-essential \
 	&& apt-get clean && rm -rf /var/lib/apt/lists/*
 
-COPY . /usr/src/app
+# Switch to working directory for our app
 WORKDIR /usr/src/app
 
+# Copy all the source code in.
+COPY . .
+
+# Compile our source code
 RUN gcc -o hello hello.c
 
+#switch on systemd init system in container
+ENV INITSYSTEM on
+
+# Lauch our binary on container startup.
 CMD ./hello

README.md

@@ -1,13 +1,3 @@
 # Hello C in Resin.io
 
 This is a very simple project that is an example of how to run C code on a device that is supported by [Resin.io](http://resin.io).
-
-### Note for Raspberry pi 1
-If the device you are planning to use is a raspberry pi 1 you will have to modify Dockerfile.template in order to use the application.
-```
-FROM resin/%%RESIN_MACHINE_NAME%%-debian
-```
-To
-```
-FROM resin/%%RESIN_MACHINE_NAME%%-raspbian
-```