新增: 增加动态修改主题色功能；

src/theme/default/color.less

@@ -0,0 +1,4 @@
+@import "../theme";
+@primary-color: @primary;
+@processing-color: @primary;
+@link-color: @primary;

src/theme/default/index.less

@@ -0,0 +1 @@
+@import "color";