This commit changes the starting point of a task from the point when the
ApplicationContext issues the ContextRefreshedEvent to
SmartLifecycle#start. This is a more accurate point of start for a task
in that all beans should now be available. It also allows us to clean
up many ApplicationContext hacks that were present to get around the
fact that many beans were not ready when a Task was attempting to begin.
Resolvesspring-cloud/spring-cloud-task#107
Added the ability to implement TaskExecutionListener functionality without
implementing the TaskExecutionListener interface.
resolvesspring-cloud/spring-cloud-task#95
TaskLifecycleListener will set a TaskExecution's exitCode to null upon taskStart in the repository.
Only at the end of the execution will it store the exitCode.
resolvesspring-cloud/spring-cloud-task#82
This is the initial cut of the reference documentation for Spring Cloud
Task.
Resolvesspring-cloud/spring-cloud-task#49
Updates per code review
use mvnw instead of mvn in example
