making gremlin script parameter aware

lib/neography/rest.rb

@@ -346,8 +346,8 @@ def execute_query(query)
           result = post("/ext/CypherPlugin/graphdb/execute_query", options)
       end
 
-      def execute_script(script)
-        options = { :body => "script=" + CGI::escape(script), :headers => {'Content-Type' => 'application/x-www-form-urlencoded'} }
+      def execute_script(script, params = {})
+        options = { :body => {:script => script, :params => params}.to_json , :headers => {'Content-Type' => 'application/json'} }
         result = post("/ext/GremlinPlugin/graphdb/execute_script", options)
         result == "null" ? nil : result
       end

spec/integration/rest_plugin_spec.rb

@@ -11,6 +11,27 @@
       root_node.should have_key("self")
       root_node["self"].split('/').last.should == "0"
     end
+
+    it "can get the a node" do
+      new_node = @neo.create_node
+      id = new_node["self"].split('/').last
+      existing_node = @neo.execute_script("g.v(#{id})")
+      existing_node.should_not be_nil
+      existing_node.should have_key("self")
+      existing_node["self"].split('/').last.should == id
+    end
+
+    it "can get the a node with a variable" do
+      new_node = @neo.create_node
+      id = new_node["self"].split('/').last
+      existing_node = @neo.execute_script("g.v(id)", {:id => id})
+      existing_node.should_not be_nil
+      existing_node.should have_key("self")
+      existing_node["self"].split('/').last.should == id
+    end
+
+
+
   end
 
   describe "execute cypher query" do