Removes dead references.

examples/cross_calculator/android/readme.txt

@@ -20,11 +20,5 @@ installed on your system, you can simply run "ant debug" to build everything.
 Once the apk is built you can install it on your device or emulator with the
 command "adb install bin/CrossCalculator-debug.apk".
 
-You can use this example as a starting point for your project or look at the
-history of the github project at https://github.com/gradha/nimrod-on-android.
-That repository documents the individual integration steps you would take for
-any Android project (note it uses Eclipse rather than ant to build and
-therefore the build process requires more manual fiddling).
-
 This example runs against the Android level 3 API, meaning devices from
 Android 1.5 and above should be able to run the generated binary.

examples/cross_calculator/ios/readme.txt

@@ -8,10 +8,6 @@ When the calculate button is used the view controller calls the Nim code to
 delegate the logic of the operation and puts the result in a label for display.
 All interface error checks are implemented in the view controller.
 
-You can use this as a starting point for your project or look at the history of
-the github project at https://github.com/gradha/nimrod-on-ios. That repository
-documents the individual integration steps you would take for any iOS project.
-
 This version of the iOS project is known to work with Xcode 4.2 and Xcode
 4.4.1. The final binary can be deployed on iOS 3.x to 5.x supporting all iOS
 platforms and versions available at the moment.

examples/cross_todo/readme.txt

@@ -3,5 +3,3 @@ called by different native user interfaces.
 
 This example builds on the knowledge learned from the cross_calculator example.
 Check it out first to learn how to set up Nim on different platforms.
-Additional implementations are provided at the external
-https://github.com/gradha/nimrod-crossplatform-todo github repository.