Bump version to 0.4-SNAPSHOT, switch the subVer field to use genjixs BIP 14 format.

pom.xml

@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google</groupId>
   <artifactId>bitcoinj</artifactId>
-  <version>0.3</version>
+  <version>0.4-SNAPSHOT</version>
   <name>BitCoinJ</name>
   <description>A Java implementation of a Bitcoin client-only node</description>
   <url>http://code.google.com/p/bitcoinj</url>

src/com/google/bitcoin/core/VersionMessage.java

@@ -80,7 +80,7 @@ public class VersionMessage extends Message {
         } catch (UnknownHostException e) {
             throw new RuntimeException(e);  // Cannot happen.
         }
-        subVer = "BitCoinJ 0.3";
+        subVer = "/BitCoinJ:0.4-SNAPSHOT/";
         bestHeight = newBestHeight;
 
         length = 84;