Adding CoffeeScript base example

Adding CoffeeScript base

sample-functions/BaseFunctions/coffee/Dockerfile

@@ -0,0 +1,19 @@
+FROM node:6.9.1-alpine
+
+ADD https://github.com/alexellis/faas/releases/download/0.5.1-alpha/fwatchdog /usr/bin
+RUN chmod +x /usr/bin/fwatchdog
+
+WORKDIR /root/
+
+COPY package.json .
+
+RUN npm install -g coffee-script && \
+    npm i
+
+COPY handler.coffee .
+
+ENV fprocess="coffee handler.coffee"
+
+HEALTHCHECK --interval=1s CMD [ -e /tmp/.lock ] || exit 1
+
+CMD ["fwatchdog"]