The telltale sign is this line:
05-03 17:40:52.829: E/AndroidRuntime(5327): Caused by: java.lang.ClassCastException: The application has specified that a custom LogFactory implementation should be used but Class 'org.apache.commons.logging.impl.LogFactoryImpl' cannot be converted to 'xc'. Please check the custom implementation. Help can be found @http://commons.apache.org/logging/troubleshooting.html.
Looks like some Apache logging's classes have been renamed by Proguard, and from the Proguard config file you have
# -keep public class org.apache.commons.** { *; }
marked as comment (with '#' prefix), therefore I'd remove '#' in the above line thus telling Proguard to not rename classes within package org.apache.commons, and try again.