Restructure all http related files

Moving all http related functions and helpers into a new http submodule

http/httpErr.go

@@ -0,0 +1,16 @@
+package http
+
+import (
+	"fmt"
+	"net/http"
+)
+
+// Return an error over an http connection.
+// The error will have the given return code `code`
+// and a json encoded body with the field "id" set to `errId`
+// and a field "message" set to the `message`
+func HttpErr(w http.ResponseWriter, errId int, message string, code int) {
+	w.WriteHeader(code)
+	w.Header().Add("Content-Type", "application/json")
+	fmt.Fprintf(w, "{\"id\": %d, \"message\": \"%s\"}", errId, message)
+}