feature(render): Add json rending supports.

- move Send from server to rex (top level).

rex.go

 package rex
 
 import (
+	"bytes"
+	"encoding/json"
+	"net/http"
 	"path"
 
 	"github.com/goanywhere/env"
 // Shortcut for string based map.
 type M map[string]interface{}
 
+// Sends the HTTP response in JSON.
+func Send(w http.ResponseWriter, v interface{}) {
+	var buffer = new(bytes.Buffer)
+	defer func() {
+		buffer.Reset()
+	}()
+
+	w.Header().Set("Content-type", "application/json; charset=utf-8")
+	if err := json.NewEncoder(buffer).Encode(v); err == nil {
+		w.Write(buffer.Bytes())
+	} else {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+// Renders a view (Pongo) and sends the rendered HTML string to the client.
+// Optional parameters: value, local variables for the view.
+// func Render(filename string, v ...interface{}) {}
+
 func init() {
 	var basedir = fs.Getcd(2)
 	env.Set("basedir", basedir)

server.go

 package rex
 
 import (
-	"bytes"
-	"encoding/json"
 	"flag"
 	"fmt"
 	"net/http"
 	self.build().ServeHTTP(w, r)
 }
 
-// Sends the HTTP response in JSON.
-func (self *server) Send(w http.ResponseWriter, v interface{}) {
-	var buffer = new(bytes.Buffer)
-
-	w.Header().Set("Content-type", "application/json; charset=utf-8")
-	if err := json.NewEncoder(buffer).Encode(v); err == nil {
-		w.Write(buffer.Bytes())
-	} else {
-		http.Error(w, err.Error(), http.StatusInternalServerError)
-	}
-}
-
-// Renders a view (Pongo) and sends the rendered HTML string to the client.
-// Optional parameters: value, local variables for the view.
-// func (self *server) Render(filename string, v ...interface{}) {}
-
 // Run starts the application server to serve incoming requests at the given address.
 func (self *server) Run() {
 	runtime.GOMAXPROCS(maxprocs)