rename project name (tutorial -> essentials)
rename package name
rename package name
Merge branch 'master' into chapter9

Conflicts:
	src/main/java/org/zkoss/essentials/chapter4/SidebarChapter4Controller.java
	src/main/java/org/zkoss/essentials/chapter5/mvc/ProfileViewController.java
	src/main/java/org/zkoss/essentials/chapter5/mvvm/ProfileViewModel.java
	src/main/java/org/zkoss/essentials/chapter6/mvc/TodoListController.java
	src/main/java/org/zkoss/essentials/chapter6/mvvm/TodoListViewModel.java
	src/main/java/org/zkoss/essentials/chapter8/AuthenticationInit.java
	src/main/java/org/zkoss/essentials/chapter8/LoginController.java
	src/main/java/org/zkoss/essentials/chapter8/LogoutController.java
Merge branch 'chapter9' into chapter10

* rename project name

Conflicts:
	src/main/java/org/zkoss/essentials/chapter5/mvc/ProfileViewController.java
	src/main/java/org/zkoss/essentials/chapter5/mvvm/ProfileViewModel.java
	src/main/java/org/zkoss/essentials/chapter8/AuthenticationInit.java
	src/main/java/org/zkoss/essentials/entity/Todo.java
	src/main/java/org/zkoss/essentials/entity/User.java
	src/main/java/org/zkoss/essentials/services/impl/TodoListServiceImpl.java
	src/main/java/org/zkoss/essentials/services/impl/UserInfoServiceImpl.java