Modified POM for better Bamboo integration

pom.xml

@@ -6,6 +6,9 @@
   <version>0.0.1-SNAPSHOT</version>
   <name>CraftBukkit</name>
   <url>http://www.bukkit.org</url>
+  <properties>
+    <build.version>unknown</build.version>
+  </properties>
   <repositories>
     <repository>
       <id>bukkut-repo</id>
@@ -49,7 +52,10 @@
             <configuration>
               <transformers>
                 <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
-                  <mainClass>org.bukkit.craftbukkit.Main</mainClass>
+                  <manifestEntries>
+                    <Main-Class>org.bukkit.craftbukkit.Main</Main-Class>
+                    <Build-Version>${build.version}</Build-Version>
+                  </manifestEntries>
                 </transformer>
               </transformers>
             </configuration>