Code Cleanup and Style Changes for AddFriendsViewController

This is a good style guide for making code easy to read and understand:
https://github.com/wordpress-mobile/WordPress-iOS/wiki/WordPress-for-iOS-Style-Guide

THe extra line breaks and spacing makes things difficult to read when other devs are contributing.
Merge pull request #1 from jstart/patch-1

Code Cleanup and Style Changes for AddFriendsViewController