revision #2: 统一修改代码注释

code/2/2.1.cpp

@@ -2,7 +2,7 @@
 // 2.1.cpp
 // c++1x tutorial
 //
-// created by changkun at shiyanlou.com
+// created by changkun at changkun.de
 //
 // nullptr
 

code/2/2.2.cpp

@@ -2,7 +2,7 @@
 // 2.2.cpp
 // c++1x tutorial
 //
-// created by changkun at shiyanlou.com
+// created by changkun at changkun.de
 //
 // constexpr
 

code/2/2.3.cpp

@@ -2,7 +2,7 @@
 // 2.3.cpp
 // c++1x tutorial
 //
-// created by changkun at shiyanlou.com
+// created by changkun at changkun.de
 //
 // auto/decltype/尾返回类型/返回类型推导
 

code/2/2.4.cpp

@@ -2,7 +2,7 @@
 // 2.4.cpp
 // c++1x tutorial
 //
-// created by changkun at shiyanlou.com
+// created by changkun at changkun.de
 //
 // 区间迭代
 

code/2/2.5.cpp

@@ -2,7 +2,7 @@
 // 2.5.cpp
 // c++1x tutorial
 //
-// created by changkun at shiyanlou.com
+// created by changkun at changkun.de
 //
 // 初始化列表
 

code/2/2.6.cpp

@@ -2,7 +2,7 @@
 // 2.6.cpp
 // c++1x tutorial
 //
-// created by changkun at shiyanlou.com
+// created by changkun at changkun.de
 //
 // 模板增强
 

code/2/2.7.cpp

@@ -2,7 +2,7 @@
 // 2.7.cpp
 // c++1x tutorial
 //
-// created by changkun at shiyanlou.com
+// created by changkun at changkun.de
 //
 // 面向对象增强
 

code/2/2.8.cpp

@@ -2,7 +2,7 @@
 // 2.8.cpp
 // c++1x tutorial
 //
-// created by changkun at shiyanlou.com
+// created by changkun at changkun.de
 //
 // 强类型枚举