Updated sample to MSAL 0.1.4 and did some minor code cleanup

[oldalton]

• Updated sample from 0.1.3 to 0.1.4 (users changed to accounts)
• I pointed it to release/0.1.4 branch for now until we merge it back to master and tag. Will update pod file when it happens
• I did some minor cleanup for the callGraphButton method - I separated it into multiple methods for easier readability. I also fixed alignment in multiple places, so it will show many changes, although there're not that many.
• I moved viewDidLoad to the beginning of the file to show PublicClientApplication creation in the very beginning.
• Looking forward to feedback for those changes.

[oldalton]

@unpluggedk, @jasoncoolmax, @antrix1989, @rohitnarula7176, @xerners I can't add reviewers here, so tagging you to provide feedback.