Don't set version (so .jars don't contain version)

build.gradle

@@ -2,10 +2,9 @@ subprojects {
     apply plugin: 'java'
 
     sourceCompatibility = 1.5
-    version = '0.9.13-8'
     jar {
         manifest {
-            attributes 'Implementation-Version': version
+            attributes 'Implementation-Version': '0.9.13-8'
         }
     }