- Added a read-only property to PodsWebService which returns the object's
  NSURLSession instance.
- Called finishTasksAndInvalidate on the NSURLSession instance when the app
  enters the background.
- Wrapped comments to 80 characters or fewer.
Merge branch 'master' of https://github.com/jkereako/issue-10-core-data-network-application

* 'master' of https://github.com/jkereako/issue-10-core-data-network-application:
  Update README.md
  Update README.md
  Update README.md