Demo app needs update for CocoaPods 1.0.0

[mfikes]

In ambly/ObjectiveC/Ambly Demo run pod install and you will get a failure regarding link_with:

$ pod install

[!] Invalid `Podfile` file: [!] The specification of `link_with` in the Podfile is now unsupported, please use target blocks instead..

 #  from /Users/mfikes/Projects/ambly/ObjectiveC/Ambly Demo/Podfile:9
 #  -------------------------------------------
 #    platform :ios, '8.0'
 >    link_with 'Ambly Demo'
 #    import_pods
 #  -------------------------------------------
$ pod --version
1.1.1
$ pwd
/Users/mfikes/Projects/ambly/ObjectiveC/Ambly Demo