SmackDebugger initialization moved to dedicated factory.

You can set your custom debugger class as before, by using clear api
method ReflectionDebuggerFactory.setDebuggerClass, or you can set custom
debugger factory using SmackConfiguration.setDebuggerFactory if it's not
enough flexible for your needs
Merge branch 'master' into xep198

Conflicts:
	smack-core/src/main/java/org/jivesoftware/smack/AbstractXMPPConnection.java
Fix DelayInformation tests so that they work with jxmpp 0.3.0