webui: add a primitive graphql handler

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+# graphql-go-handler [![Build Status](https://travis-ci.org/graphql-go/handler.svg)](https://travis-ci.org/graphql-go/handler) [![GoDoc](https://godoc.org/graphql-go/handler?status.svg)](https://godoc.org/github.com/graphql-go/handler) [![Coverage Status](https://coveralls.io/repos/graphql-go/handler/badge.svg?branch=master&service=github)](https://coveralls.io/github/graphql-go/handler?branch=master) [![Join the chat at https://gitter.im/graphql-go/graphql](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/graphql-go/graphql?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
+Golang HTTP.Handler for [graphl-go](https://github.com/graphql-go/graphql)
+
+### Notes:
+This is based on alpha version of `graphql-go` and `graphql-relay-go`.
+Be sure to watch both repositories for latest changes.
+
+### Usage
+
+```go
+package main
+
+import (
+	"net/http"
+	"github.com/graphql-go/handler"
+)
+
+func main() {
+
+	// define GraphQL schema using relay library helpers
+	schema := graphql.NewSchema(...)
+
+	h := handler.New(&handler.Config{
+		Schema: &schema,
+		Pretty: true,
+		GraphiQL: true,
+	})
+
+	// serve HTTP
+	http.Handle("/graphql", h)
+	http.ListenAndServe(":8080", nil)
+}
+```
+
+### Details
+
+The handler will accept requests with
+the parameters:
+
+  * **`query`**: A string GraphQL document to be executed.
+
+  * **`variables`**: The runtime values to use for any GraphQL query variables
+    as a JSON object.
+
+  * **`operationName`**: If the provided `query` contains multiple named
+    operations, this specifies which operation should be executed. If not
+    provided, an 400 error will be returned if the `query` contains multiple
+    named operations.
+
+GraphQL will first look for each parameter in the URL's query-string:
+
+```
+/graphql?query=query+getUser($id:ID){user(id:$id){name}}&variables={"id":"4"}
+```
+
+If not found in the query-string, it will look in the POST request body.
+The `handler` will interpret it
+depending on the provided `Content-Type` header.
+
+  * **`application/json`**: the POST body will be parsed as a JSON
+    object of parameters.
+
+  * **`application/x-www-form-urlencoded`**: this POST body will be
+    parsed as a url-encoded string of key-value pairs.
+
+  * **`application/graphql`**: The POST body will be parsed as GraphQL
+    query string, which provides the `query` parameter.
+
+
+### Examples
+- [golang-graphql-playground](https://github.com/graphql-go/playground)
+- [golang-relay-starter-kit](https://github.com/sogko/golang-relay-starter-kit)
+- [todomvc-relay-go](https://github.com/sogko/todomvc-relay-go)
+
+### Test
+```bash
+$ go get github.com/graphql-go/handler
+$ go build && go test ./...