Move view classes to view package
Refactor to adapt m prefix for class member variable

I know most java devs do not use Hungarian notation for variables but
Android code style guide adapt this style. Normally I always uses `this.`
but it does not work in referencing a member variable in an anonymous class.
So I think this prefix style makes code look consistent for member variables.
Create simple task and when data model
Add TaskService and NextTaskListener
Implement NewTaskActivity with TaskService and data model
Implement simple NextTaskListener to plug with TaskService
Set wrapping on chained method calls in project's coding style.
Reformat code