Added transactions support

src/main/java/redis/clients/jedis/TransactionBlock.java

@@ -0,0 +1,16 @@
+package redis.clients.jedis;
+
+public abstract class TransactionBlock extends Transaction {
+    public TransactionBlock(Client client) {
+	super(client);
+    }
+
+    public TransactionBlock() {
+    }
+
+    public abstract void execute() throws JedisException;
+
+    public void setClient(Client client) {
+	this.client = client;
+    }
+}