Added SVSegmentedControl submodule

Also added the main class files to the Xcodeproj: SVSegmentedControl and SVSegmentedThumb.

Hmm… I should probably be using CocoaPods for this kind of stuff.
SVSegmentedControl fixes for NSArray properties to have copy ownership, and some missing retains/releases
OptionsDrawer modeSwitch added and hooked up

OptionsDrawerView now points to a placeholder element in XIB and during load swaps in a SVSegmentedControl (since we don't have an IB plugin for SVSegmentedControl).

OptionsDrawerView also provides an smarter interface for the SVSegmentedControl, providing an OptionsDrawerRenderModeState enum and state accessor methods.

RootViewController makes sure the renderMode switch stays in sync with the current view, and implements renderModeSwitchValueChanged: and setViewControllers:animated:completion: for this purpose.  (This implementation is a bit hack-y because it's still adhering to the UIPageViewController concept of previous/next controllers.  An independent RenderModeViewControler/Delegate/DataSource would be better, with a compatibility adaptor for UIPageViewController would be a better idea.  This would also unify the lists of render modes/controllers, which currently exist in ~3 places.)
SVSegmentedControl submodule removed

To be replaced with that pod thing.

Also removed from project.
SVSegmentedControl.deARCed pod added

Podfile, plus all the other stuff it adds.

And it completely rewrote my pbxproj file to XML!  I felt just a little violated by that, so I converted it back to the ASCII plist format with good 'ol TextMate and then re-saved it with Xcode, leaving only the actual changes the `pod install` command made.  Yay!
Merge branch 'feature/options-drawer'