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/smack/provider/VmArgInitializer.java

@@ -0,0 +1,23 @@
+package org.jivesoftware.smack.provider;
+
+
+/**
+ * Looks for a provider file location based on the VM argument <i>smack.provider.file</>.  If it is supplied, its value will 
+ * be used as a file location for a providers file and loaded into the {@link ProviderManager} on Smack initialization.
+ *  
+ * @author Robin Collier
+ *
+ */
+public class VmArgInitializer extends UrlProviderFileInitializer {
+
+    protected String getFilePath() {
+        return System.getProperty("smack.provider.file");
+    }
+
+    @Override
+    public void initialize() {
+        if (getFilePath() != null) {
+            super.initialize();
+        }
+    }
+}