Phonegap 2.9.0 Error

[olimortimer]

This is the first time using a plugin on Phonegap, so apologies if I've missed something out. However, if I follow the README in the 2.3+ directory, Xcode throws a few errors;

https://github.com/DrewDahlman/Phonegap-LocalNotification/tree/master/cordova2.3%2B

/.../CordovaLib/Classes/CDVInAppBrowser.h:59:1: No 'assign', 'retain', or 'copy' attribute is specified - 'assign' is assumed
/.../CordovaLib/Classes/CDVInAppBrowser.h:59:1: Default property attribute 'assign' not appropriate for non-GC object

/.../CordovaLib/Classes/CDVPlugin.m:149:25: Unused variable 'localNotification'

The notifications seem to work (at least, the example code works), so a little confused about the errors.