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-compression-jzlib/build.gradle

@@ -0,0 +1,8 @@
+description = """\
+Compression with jzlib
+Allow to compress the XMPP stream with help of jzlib."""
+
+dependencies {
+	compile project(path: ':smack-core', configuration: 'compression')
+	compile 'com.jcraft:jzlib:1.1.3'
+}

smack-compression-jzlib/src/main/java/org/jivesoftware/smack/compression/JzlibInputOutputStream.java

@@ -0,0 +1,67 @@
+/**
+ *
+ * Copyright 2013-2014 Florian Schmaus
+ *
+ * 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.smack.compression;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import org.jivesoftware.smack.SmackConfiguration;
+
+import com.jcraft.jzlib.JZlib;
+import com.jcraft.jzlib.ZInputStream;
+import com.jcraft.jzlib.ZOutputStream;
+
+/**
+ * This class provides XMPP "zlib" compression with the help of JZLib.
+ * 
+ * @author Florian Schmaus
+ * @see <a href="http://www.jcraft.com/jzlib/">JZLib</a>
+ * 
+ */
+@SuppressWarnings("deprecation")
+public class JzlibInputOutputStream extends XMPPInputOutputStream {
+
+    static {
+        SmackConfiguration.addCompressionHandler(new JzlibInputOutputStream());
+    }
+
+    public JzlibInputOutputStream() {
+        compressionMethod = "zlib";
+    }
+
+    @Override
+    public boolean isSupported() {
+        return true;
+    }
+
+    @Override
+    public InputStream getInputStream(InputStream inputStream) throws IOException {
+        ZInputStream is = new ZInputStream(inputStream);
+        is.setFlushMode(JZlib.Z_SYNC_FLUSH);
+
+        return is;
+    }
+
+    @Override
+    public OutputStream getOutputStream(OutputStream outputStream) throws IOException {
+        ZOutputStream os = new ZOutputStream(outputStream);
+        os.setFlushMode(JZlib.Z_SYNC_FLUSH);
+
+        return os;
+    }
+}