Prefix subprojects with 'smack-'

instead of using the old baseName=smack appendix=project.name approach,
we are now going convention over configuration and renaming the
subprojects directories to the proper name.

Having a prefix is actually very helpful, because the resulting
libraries will be named like the subproject. And a core-4.0.0-rc1.jar is
not as explicit about what it actually *is* as a
smack-core-4.0.0-rc1.jar.

SMACK-265

smack-experimental/src/main/java/org/jivesoftware/smackx/ExperimentalStartupClasses.java

@@ -0,0 +1,54 @@
+/**
+ *
+ * Copyright 2014 Andriy Tsykholyas
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx;
+
+import org.jivesoftware.smack.SmackConfiguration;
+import org.jivesoftware.smack.initializer.SmackInitializer;
+import org.jivesoftware.smack.util.FileUtils;
+
+import java.io.InputStream;
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * {@link SmackInitializer} implementation for experimental module.
+ */
+public class ExperimentalStartupClasses implements SmackInitializer {
+
+    private static final String EXTENSIONS_XML = "classpath:org.jivesoftware.smackx/extensions.xml";
+
+    private List<Exception> exceptions = new LinkedList<Exception>();
+    // TODO log
+
+    @Override
+    public void initialize() {
+        InputStream is;
+        try {
+            is = FileUtils.getStreamForUrl(EXTENSIONS_XML, null);
+            SmackConfiguration.processConfigFile(is, exceptions);;
+        }
+        catch (Exception e) {
+            exceptions.add(e);
+        }
+    }
+
+    @Override
+    public List<Exception> getExceptions() {
+        return Collections.unmodifiableList(exceptions);
+    }
+}