Switch use of popup to an inline frame for OAuth landing to avoid potential issues with popup blockers or browser quirks related to popups. Add note clarifying that you should be already authenticated into Facebook in the browser you are using prior to executing the OAuth flow for a seamless experience. Possibly addresses issues mentioned in #8
Merge branch 'master' of https://github.com/ptwobrussell/Mining-the-Social-Web-2nd-Edition