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-extensions/src/main/java/org/jivesoftware/smackx/attention/packet/AttentionExtension.java

@@ -0,0 +1,97 @@
+/**
+ *
+ * Copyright 2003-2010 Jive Software.
+ *
+ * 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.attention.packet;
+
+import org.jivesoftware.smack.packet.PacketExtension;
+import org.jivesoftware.smack.provider.PacketExtensionProvider;
+import org.xmlpull.v1.XmlPullParser;
+
+/**
+ * A PacketExtension that implements XEP-0224: Attention
+ * 
+ * This extension is expected to be added to message stanzas of type 'headline.'
+ * Please refer to the XEP for more implementation guidelines.
+ * 
+ * @author Guus der Kinderen, guus.der.kinderen@gmail.com
+ * @see <a
+ *      href="http://xmpp.org/extensions/xep-0224.html">XEP-0224:&nbsp;Attention</a>
+ */
+public class AttentionExtension implements PacketExtension {
+
+    /**
+     * The XML element name of an 'attention' extension.
+     */
+    public static final String ELEMENT_NAME = "attention";
+
+    /**
+     * The namespace that qualifies the XML element of an 'attention' extension.
+     */
+    public static final String NAMESPACE = "urn:xmpp:attention:0";
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.jivesoftware.smack.packet.PacketExtension#getElementName()
+     */
+    public String getElementName() {
+        return ELEMENT_NAME;
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.jivesoftware.smack.packet.PacketExtension#getNamespace()
+     */
+    public String getNamespace() {
+        return NAMESPACE;
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.jivesoftware.smack.packet.PacketExtension#toXML()
+     */
+    public String toXML() {
+        final StringBuilder sb = new StringBuilder();
+        sb.append("<").append(getElementName()).append(" xmlns=\"").append(
+                getNamespace()).append("\"/>");
+        return sb.toString();
+    }
+
+    /**
+     * A {@link PacketExtensionProvider} for the {@link AttentionExtension}. As
+     * Attention elements have no state/information other than the element name
+     * and namespace, this implementation simply returns new instances of
+     * {@link AttentionExtension}.
+     * 
+     * @author Guus der Kinderen, guus.der.kinderen@gmail.com
+s     */
+    public static class Provider implements PacketExtensionProvider {
+
+        /*
+         * (non-Javadoc)
+         * 
+         * @see
+         * org.jivesoftware.smack.provider.PacketExtensionProvider#parseExtension
+         * (org.xmlpull.v1.XmlPullParser)
+         */
+        public PacketExtension parseExtension(XmlPullParser arg0)
+                throws Exception {
+            return new AttentionExtension();
+        }
+    }
+}