autolayout adjustments made for convenience

Source/MaterialButton.swift

@@ -99,7 +99,6 @@ public class MaterialButton : UIButton {
 		:name:	drawRect
 	*/
 	final public override func drawRect(rect: CGRect) {
-		prepareContext(rect)
 		prepareBackgroundColorView()
 		prepareButton()
 	}
@@ -152,18 +151,6 @@ public class MaterialButton : UIButton {
 	}
 	
 	//
-	//	:name:	prepareContext
-	//
-	private func prepareContext(rect: CGRect) {
-		let context = UIGraphicsGetCurrentContext()
-		CGContextSaveGState(context);
-		CGContextAddEllipseInRect(context, rect)
-		CGContextSetFillColorWithColor(context, MaterialTheme.clear.color.CGColor)
-		CGContextFillPath(context)
-		CGContextRestoreGState(context);
-	}
-	
-	//
 	//	:name: prepareBackgroundColorView
 	//
 	private func prepareBackgroundColorView() {

Source/NavigationViewController.swift

@@ -25,6 +25,7 @@ public class NavigationViewController: UIViewController {
 	public var titleLabel: UILabel? {
 		didSet {
 			if let v = titleLabel {
+				v.translatesAutoresizingMaskIntoConstraints = false
 				view.addSubview(v)
 			}
 		}
@@ -36,6 +37,7 @@ public class NavigationViewController: UIViewController {
 	public var leftButton: FlatButton? {
 		didSet {
 			if let v = leftButton {
+				v.translatesAutoresizingMaskIntoConstraints = false
 				view.addSubview(v)
 			}
 		}
@@ -47,6 +49,7 @@ public class NavigationViewController: UIViewController {
 	public var rightButton: FlatButton? {
 		didSet {
 			if let v = rightButton {
+				v.translatesAutoresizingMaskIntoConstraints = false
 				view.addSubview(v)
 			}
 		}