feat(debug-proxy): add http debug proxy image

images/debug-proxy/Dockerfile

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+FROM node:0.12
+ADD script.js /script.js
+CMD ["node", "/script.js"]

images/debug-proxy/README.md

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+
+HTTP debugging proxy
+
+## Usage
+
+```yaml
+  debugproxy:
+    image: pelias/debug-proxy:latest
+    container_name: debugproxy
+    restart: always
+    environment: [ "HOST=placeholder", "PORT=4100" ]
+    ports: [ "8000:8000" ]
+```
+
+## Rebuild image
+
+```bash
+docker build -t pelias/debug-proxy .
+```
+
+## Credit
+
+Source code copied from:
+https://github.com/acroca/http-docker-debug-proxy

images/debug-proxy/script.js

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+var net = require("net");
+
+// copied from https://github.com/acroca/http-docker-debug-proxy
+// credit: https://github.com/acroca
+
+var host = process.env["HOST"];
+var port = process.env["PORT"];
+var bindPort = process.env["BIND"] || 8000;
+
+proxy = net.createServer(function(socket){
+  var client;
+  console.log('**** Client connected to proxy');
+
+  client = net.connect({port: port, host: host});
+
+  clientToServer = socket.pipe(client)
+  serverToClient = clientToServer.pipe(socket);
+
+  socket.on('close', function () {
+      console.log('**** Client disconnected from proxy');
+  });
+  socket.on('error', function (err) {
+      console.log('Error: ' + err.soString());
+  });
+
+  socket.on('data', function(d) {
+    var s = d.toString()
+    console.log("=> " + s.replace(/\n/g, "\n=> "))
+  })
+  clientToServer.on('data', function(d) {
+    var s = d.toString()
+    console.log("<= " + s.replace(/\n/g, "\n<= "))
+  })
+
+})
+proxy.listen(bindPort)