library for JSON parsing added

build/scripts/layouts.gant

@@ -487,6 +487,7 @@ def layout_core(String home, String target) {
       include(name: "asm.jar")
       include(name: "asm-commons.jar")
       include(name: "cli-10.jar")
+      include(name: "gson-2.0.jar")
     }
   }
 }

lib/required_for_dist.txt

@@ -11,6 +11,7 @@ commons-logging-1.1.1.jar
 commons-net-2.0-patched.jar
 dtdparser113.jar
 groovy-all-1.7.3.jar
+gson-2.0.jar
 guava-r09.jar
 jaxen-1.1.3.jar
 jcip-annotations.jar