SMACK-286 Made ProviderManager much more configurable.

Separated the reading of provider files from the ProviderManager.  Manager now only manages.  Added ability to add collections of providers to the manager via a ProviderLoader, of which there is one default implementation which loads from the default file format.  Now provider files can be programmatically added at any time.  Also updated the configuration abilities so that a provider file can also be set via VM arg, as well as the smack configuration itself. Introduced Java Util Logging as well.

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/branches/smack_3_4_0@13861 b35dd754-fafc-0310-a699-88a17e54d16e

source/org/jivesoftware/smackx/provider/ExtensionInitializer.java

@@ -0,0 +1,16 @@
+package org.jivesoftware.smackx.provider;
+
+import org.jivesoftware.smack.provider.UrlProviderFileInitializer;
+
+/**
+ * Loads the default provider file for the Smack extensions on initialization.
+ * 
+ * @author Robin Collier
+ *
+ */
+public class ExtensionInitializer extends UrlProviderFileInitializer {
+    @Override
+    protected String getFilePath() {
+        return "classpath:META-INF/extension.providers";
+    }
+}