Add documentation for UIToolbar changes

Documentation/UIToolbar.md

@@ -0,0 +1,16 @@
+## UIToolbar
+
+Unit testing the behavior of items on `UIToolbar`s through UIKit is ordinarily a challenge because of how
+ difficult accessing the toolbar items directly can be.
+
+Fleet aims to erase this pain by providing a way to "tap" on tooltip items in-test to fire their associated handlers.
+
+Suppose you have a `UIToolbar` set up on a page in your storyboard. With Fleet, you can unit test the behavior of
+ tapping that toolbar's items much more easily than before. With one simple line of code, an item's handler can be fired:
+```swift
+// Suppose we have items in a toolbar associated with `navigationController`
+let toolbar = navigationController.toolbar!
+toolbar.tapItem(withTitle: "Some Item")
+
+// Now you can make any assertions you'd like on the behavior of tapping that item.
+```

Fleet/CoreExtensions/Toolbar/UIToolbar+Fleet.swift

@@ -19,6 +19,17 @@ extension Fleet {
 }
 
 extension UIToolbar {
+    /**
+     Mimics a tap on the toolbar item with the given title,
+     firing any associated behavior.
+
+     - parameters:
+        - title:  The title of the item to tap
+
+     - throws:
+        A `FleetError` if a toolbar item with the given title cannot be found, if there
+        in the are no items in the toolbar, or if the item's action is not properly set up.
+     */
     public func tapItem(withTitle title: String) {
         guard let toolbarItems = items else {
             FleetError(Fleet.ToolbarError.noToolbarItems).raise()

README.md

@@ -28,6 +28,7 @@ Fleet extends UIKit classes in order to make it easier to test your code's inter
 - [UITextField](./Documentation/UITextField.md) - Provides convenience methods for entering text. (iOS-only)
 - [UISwitch](./Documentation/UISwitch.md) - Provides convenience methods for interacting with switches in test. (iOS-only)
 - [UITextView](./Documentation/UITextView.md) - Provides convenience methods for entering text into a text view. (iOS-only)
+- [UIToolbar](./Documentation/UIToolbar.md) - Tap on items in a toolbar. (iOS-only)
 
 ### Setup for view controller tests
 Fleet provides another method of help in setting up view controller alongside storyboard injection and mocking. It makes it easy