Metadata adding on requests support added. StartRequests function implemented.

request.go

@@ -0,0 +1,11 @@
+package geziyor
+
+import (
+	"net/http"
+)
+
+// Request is a small wrapper around *http.Request that contains Metadata
+type Request struct {
+	*http.Request
+	Meta map[string]interface{}
+}