minor cleanups

Source/CapturePreview.swift

@@ -194,7 +194,7 @@ public class Preview: UIView {
 	//	
 	private func viewWithColor(color: UIColor) -> UIView {
 		let view: UIView = UIView(frame: Preview.boxBounds)
-		view.backgroundColor = .clearColor()
+		view.backgroundColor = MaterialTheme.clear.color
 		view.layer.borderColor = color.CGColor
 		view.layer.borderWidth = 5
 		view.hidden = true

Source/SideNavController.swift

@@ -1213,7 +1213,7 @@ public class SideNavController: UIViewController, UIGestureRecognizerDelegate {
 	//
 	private func prepareMainContainer() {
 		mainViewContainer = UIView(frame: view.bounds)
-		mainViewContainer!.backgroundColor = .clearColor()
+		mainViewContainer!.backgroundColor = MaterialTheme.clear.color
 		mainViewContainer!.autoresizingMask = .FlexibleHeight | .FlexibleWidth
 		view.addSubview(mainViewContainer!)
 	}
@@ -1272,7 +1272,7 @@ public class SideNavController: UIViewController, UIGestureRecognizerDelegate {
 		b.origin.x = originX
         b.origin.y = originY
 		viewContainer = UIView(frame: b)
-		viewContainer!.backgroundColor = .clearColor()
+		viewContainer!.backgroundColor = MaterialTheme.clear.color
 		viewContainer!.autoresizingMask = .FlexibleHeight
 		view.addSubview(viewContainer!)
 	}

Source/TextView.swift

@@ -140,14 +140,14 @@ public class TextView: UITextView {
 	//	:description:	Sets up the common initilized values.
 	//
 	private func setupView() {
-		backgroundColor = .clearColor()
+		backgroundColor = MaterialTheme.clear.color
 		textColor = MaterialTheme.black.color
 		label.font = font
 		label.textColor = MaterialTheme.blueGrey.lighten3
 		label.textAlignment = textAlignment
 		label.text = placeholder
 		label.numberOfLines = 0
-		label.backgroundColor = UIColor.clearColor()
+		label.backgroundColor = MaterialTheme.clear.color
 		label.setTranslatesAutoresizingMaskIntoConstraints(false)
 		addSubview(label)