Add live demo link & resolve a pod spec warning

Author: yacir

README.md

@@ -8,8 +8,10 @@
 ## Overview
 YBSlantedCollectionViewLayout is a subclass of UICollectionViewLayout allowing the display of slanted content on UICollectionView.
 
+## [Live Demo] (https://appetize.io/app/nd8vgwg0rkke19nmw3wzkapr5g)
+
 <p align="center" >
-	<iframe src="https://appetize.io/embed/nd8vgwg0rkke19nmw3wzkapr5g?device=iphone5s&scale=75&autoplay=true&orientation=portrait&deviceColor=black" width="274px" height="587px" frameborder="0" scrolling="no"></iframe>
+  	<img src="https://cloud.githubusercontent.com/assets/2587473/13427516/d9af399e-dfb4-11e5-8109-ae997dc7c340.gif" alt="YBSlantedCollectionViewLayout" title="YBSlantedCollectionViewLayout"> 
 </p>
 
 ## Usage

YBSlantedCollectionViewLayout.podspec

@@ -8,7 +8,6 @@ Pod::Spec.new do |s|
                        DESC
 
   s.homepage         = "https://github.com/yacir/YBSlantedCollectionViewLayout"
-  s.screenshots     = "https://raw.githubusercontent.com/yacir/YBSlantedCollectionViewLayout/master/Screenshots/YBSlantedCollectionViewLayout.gif"
   s.license          = 'MIT'
   s.author           = { "Yassir Barchi" => "dev.yassir@gmail.com" }
   s.source           = { :git => "https://github.com/yacir/YBSlantedCollectionViewLayout.git", :tag => s.version.to_s }