Don't package android local files to npm

Author: Minishlink

.npmignore

@@ -40,7 +40,9 @@ code-push-plugin-testing-framework/
 # Android build artifacts and Android Studio bits
 android/app/build
 android/local.properties
+android/app/local.properties
 android/.gradle
+android/app/.gradle
 android/**/*.iml
 android/.idea