Polish Javadoc

Fix syntax for @author and @since tags, for the same reasons detailed in
commits 7d2cf7f and c38907b, respectively.

Recommendations:

 - Disable automatic Javadoc templates completely within IDEA.
 - Add Javadoc by hand when new classes are created.
 - Follow the proper conventions for `@author` and `@since` tags.
 - Do not add @since tags in src/test classes. Javadoc for these types
   will never be generated or published, and developers can query
   creation date metadata (more accurately) from git for these classes.

Note that in the future--particularly once ethereumj has its own
independent versioning--it will be desirable to use `@since` tags with
version values (for semantic versioning clarity, backward compatibility
analysis and communication, etc). Until then, the `@since DD.MM.YY`
approach will suffice.

ethereumj-core/src/main/java/org/ethereum/datasource/KeyValueDataSource.java

@@ -4,11 +4,9 @@ import java.util.Map;
 import java.util.Set;
 
 /**
- *
- * @author: Roman Mandeleil
- * Created on: 18/01/2015 21:40
+ * @author Roman Mandeleil
+ * @since 18.01.2015
  */
-
 public interface KeyValueDataSource {
 
     public void init();

ethereumj-core/src/main/java/org/ethereum/datasource/LevelDbDataSource.java

@@ -20,11 +20,9 @@ import java.util.Set;
 import static org.iq80.leveldb.impl.Iq80DBFactory.factory;
 
 /**
- *
- * @author: Roman Mandeleil
- * Created on: 18/01/2015 21:48
+ * @author Roman Mandeleil
+ * @since 18.01.2015
  */
-
 public class LevelDbDataSource implements KeyValueDataSource{
 
     private static final Logger logger = LoggerFactory.getLogger("db");

ethereumj-core/src/main/java/org/ethereum/datasource/RedisDataSource.java

@@ -11,11 +11,9 @@ import java.util.concurrent.atomic.AtomicInteger;
 import static org.ethereum.config.SystemProperties.CONFIG;
 
 /**
- *
- * @author: Roman Mandeleil
- * Created on: 18/01/2015 21:48
+ * @author Roman Mandeleil
+ * @since 18.01.2015
  */
-
 public class RedisDataSource implements KeyValueDataSource{
 
     String name;

ethereumj-core/src/main/java/org/ethereum/db/BlockStore.java

@@ -8,10 +8,9 @@ import java.math.BigInteger;
 import java.util.List;
 
 /**
- * @author: Roman Mandeleil
- * Created on: 08/01/2015 10:27
+ * @author Roman Mandeleil
+ * @since 08.01.2015
  */
-
 public interface BlockStore {
 
     public byte[] getBlockHashByNumber(long blockNumber);

ethereumj-core/src/main/java/org/ethereum/db/BlockStoreDummy.java

@@ -9,15 +9,14 @@ import java.math.BigInteger;
 import java.util.List;
 
 /**
- * @author: Roman Mandeleil
- * Created on: 08/01/2015 17:33
+ * @author Roman Mandeleil
+ * @since 08.01.2015
  */
-
 public class BlockStoreDummy  implements BlockStore{
-    
+
     @Override
     public byte[] getBlockHashByNumber(long blockNumber) {
-        
+
         byte[] data = String.valueOf(blockNumber).getBytes();
         return HashUtil.sha3(data);
     }

ethereumj-core/src/main/java/org/ethereum/vm/PrecompiledContracts.java

@@ -6,9 +6,8 @@ import org.ethereum.util.ByteUtil;
 
 /**
  * @author Roman Mandeleil
- * Created on: 09/01/2015 08:05
+ * @since 09.01.2015
  */
-
 public class PrecompiledContracts {
     
     private static ECRecover  ecRecover  = new ECRecover();

ethereumj-core/src/test/java/test/ethereum/datasource/RedisDataSourceTest.java

@@ -7,10 +7,8 @@ import org.spongycastle.util.encoders.Hex;
 import redis.clients.jedis.exceptions.JedisConnectionException;
 
 /**
- * @author: Roman Mandeleil
- * Created on: 18/01/2015 22:40
+ * @author Roman Mandeleil
  */
-
 public class RedisDataSourceTest {
     
    

ethereumj-core/src/test/java/test/ethereum/vm/PrecompiledContractTest.java

@@ -11,10 +11,8 @@ import org.spongycastle.util.encoders.Hex;
 import static org.junit.Assert.*;
 
 /**
- * @author: Roman Mandeleil
- * Created on: 09/01/2015 08:28
+ * @author Roman Mandeleil
  */
-
 public class PrecompiledContractTest {