Initial Commit
Create AppMenuViewController and testing/demo harness.

AppMenuViewController Class:
-----------------------------
The AppMenuViewController class is a view controller that presents a
main view controller and four accessory view controllers. The accessory
view controllers are visible by animating the main controller out of the
way, revealing one of the accessory view controllers. The transition
type, animation curve, animation timing and travel distance are
configurable for each accessory view controller.

Testing/Demo Harness:
----------------------
A testing/demo harness is included in the project as a separate target.
The harness allows for setting the parameters for each accessory view
controller and viewing the animated reveal.

Future Work:
-------------
* Additional transition types are planned, including:
  * a method that moves the accessory view controller over the main view
    controller
  * a method that causes the accessory view controller to push the main
    view controller to the side
* Add shadows to the views to reinforce the z-axis hierarchy
Merge branch 'master' of https://github.com/ryanq/AppMenuViewController

Initial push to GitHub