Include markdown sample

Fix UI refresh problem
Enable invocation from portal

sample-functions/MarkdownRender/Dockerfile

@@ -0,0 +1,16 @@
+FROM alpine:latest
+
+WORKDIR /root/
+
+EXPOSE 8080
+ENV http_proxy      ""
+ENV https_proxy     ""
+
+ADD https://github.com/alexellis/faas/releases/download/v0.3-alpha/fwatchdog /usr/bin
+RUN chmod +x /usr/bin/fwatchdog
+# COPY fwatchdog  /usr/bin/
+
+COPY app    .
+
+ENV fprocess="/root/app"
+CMD ["fwatchdog"]

sample-functions/MarkdownRender/Dockerfile.build

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+FROM golang:1.7.3
+RUN mkdir -p /go/src/app
+COPY handler.go /go/src/app
+WORKDIR /go/src/app
+RUN go get github.com/microcosm-cc/bluemonday && \
+    go get github.com/russross/blackfriday
+
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o app .
+
+CMD ["echo"]

sample-functions/MarkdownRender/build.sh

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+#!/bin/sh
+echo Building alexellis2/faas-markdownrender:build
+
+docker build --build-arg https_proxy=$https_proxy --build-arg http_proxy=$http_proxy \
+    -t alexellis2/faas-markdownrender . -f Dockerfile.build
+
+docker create --name render_extract alexellis2/faas-markdownrender
+docker cp render_extract:/go/src/app/app ./app
+docker rm -f render_extract
+
+echo Building alexellis2/faas-markdownrender:latest
+docker build --no-cache -t alexellis2/faas-markdownrender:latest .

sample-functions/MarkdownRender/handler.go

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+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"github.com/microcosm-cc/bluemonday"
+	"github.com/russross/blackfriday"
+)
+
+func main() {
+	input, _ := ioutil.ReadAll(os.Stdin)
+	unsafe := blackfriday.MarkdownCommon([]byte(input))
+	html := bluemonday.UGCPolicy().SanitizeBytes(unsafe)
+	fmt.Println(string(html))
+}