Add body return func

Request.go

@@ -14,6 +14,7 @@ type Request interface {
 	Path() string
 	Scheme() string
 	Param(string) string
+	Body() []byte
 }
 
 // Represents the HTTP request used in the given context.
@@ -80,3 +81,8 @@ func (req *request) addParameter(key string, value string) {
 		Value: value,
 	})
 }
+
+// Gets the request body.
+func (req *request) Body() []byte {
+	return req.body
+}