ParsePlatform/IntegratingFacebookTutorial — pull request #26 by esong (2014-12-15 07:42:28+00:00)
Title: Fix ParseFacebookUtils uninitialized exceptions.

Repro steps:
1. Log in to the app.
2. Close the app.
3. Reopen.

- Add ParseFacebookUtils.init() in Application.
* In LoginActivity.onCreate(), UserDetailsActivity is shown right
after the user has logged in.
* If user has logged in and then closed the app, the app will crash
after the user reopen the app since ParseFacebookUtils is not inited
in the code path.