This introduces a listener that stores the association between a Spring
Batch job and the task it was executed within.
Resolvesspring-cloud/spring-cloud-task#46
Merge Changes based on code review.
* Timestamp Demonstrates a Spring boot/task application as a single java file.
* HelloWorld Demonstrates a Spring boot/task application using java configuration.
resolvesspring-cloud/spring-cloud-task#23
* `DefaultTaskConfigurer` returns only one `SimpleTaskRepository` all others have been removed
* `SimpleTaskRepository` can use `JdbcTaskExecutionDao` or a `MapTaskExecutionDao`
* Add `Jdbc` and Map` `TaskRepositoryFactoryBeans` to support the creation of the correct type of `SimpleTaskRepository`
* `TaskDatabaseInitializer` will initialize a database if a datasource is found and if they have not disabled it using the `spring.task.initialize.enable`
* Add tests
* Added Transaction Support
* Re-add the samples to `pom.xml`
* Samples pom skips install and deploy lifecycle targets.
