Merge pull request #398 from jbranchaud/master

Adding an iOS link to the slides and videos for the online course offere...

free-programming-books.md

@@ -644,6 +644,7 @@
 ###iOS
 * [iOS Succinctly, Syncfusion](http://www.syncfusion.com/resources/techportal/ebooks/ios) (PDF, Kindle) *(Just fill the fields with any values)*
 * [Start Developing iOS Apps Today](https://developer.apple.com/library/ios/referencelibrary/GettingStarted/RoadMapiOS/RoadMapiOS.pdf) (PDF)
+* [Developing iOS 7 Apps for iPhone and iPad](https://itunes.apple.com/us/course/developing-ios-7-apps-for/id733644550) (slides and videos) - Stanford University
 
 
 ###J