Logging in with Facebook now works!

- [Booklvrs/Booklvrs.xcodeproj/project.pbxproj]
Xcode project file….

- [Booklvrs/Booklvrs/BKAppDelegate.m]
Added function(s) to use Parse with Facebook

- [Booklvrs/Booklvrs/BKLogInViewController.h]
Header file for subclassing of Parse's login view controller

- [Booklvrs/Booklvrs/BKLogInViewController.m]
Subclassed Parse's login view so that our own logo could be included

- [Booklvrs/Booklvrs/BKMainViewController.h]
Made this a delegate of the login view controller

- [Booklvrs/Booklvrs/BKMainViewController.m]
Added presentation of login view. Still not handling success.
Made it prettier

- [Booklvrs/Booklvrs/Booklvrs-Info.plist]
Adjustments so that we can use Facebook
Merge branch 'master' of https://github.com/yjkogan/booklvrs
Putting together the page from which the user can submit their info

- BKMainViewController.m
Added logout button to the main page
If the user is already logged in, ask for their info

- BKUserInfoViewController
VC and view to collect the user's info and store it in Parse (storing not yet implemented)
Merge branch 'master' of https://github.com/yjkogan/booklvrs