Documentation updates
Added UITableView spies
Added UICollectionView spies
Documentation fixes
Added some UITextField spies
Added note to UIView spies documentation
Added some UITextView spies
Added some UINavigationController spies
Updated nil checks in tests
Replaced text field and text view responder spies with UIResponder spy like it should have been in the first place
Added a UITabBarController spy
Reorganized file structure
Fixed a spy test
Added a UIPageViewController spy
Updated in-source comment formatting to match Swift
Added some UIWebView spies
Fixed a test name
Added some UIWindow spies
Added some UINavigationBar spies
Added a spy to UIToolbar