DATAMONGO-479 - Add support for calling functions.

We added ScriptOperations to MongoTemplate. Those allow storage and execution of java script function directly on the MongoDB server instance. Having ScriptOperations in place builds the foundation for annotation driver support in repository layer.

Original pull request: #254.

src/main/asciidoc/reference/mongodb.adoc

@@ -1325,6 +1325,25 @@ MapReduceResults<ValueObject> results = mongoOperations.mapReduce(query, "jmr1",
 
 Note that you can specify additional limit and sort values as well on the query but not skip values.
 
+[[mongo.server-side-scripts]]
+== Script Operations
+
+MongoDB allows to execute JavaScript functions on the server by either directly sending the script or calling a stored one. `ScriptOperations` can be accessed via `MongoTemplate` and provides basic abstraction for `JavaScript` usage.
+
+=== Example Usage
+
+[source,java]
+----
+ScriptOperations scriptOps = template.scriptOps();
+
+ServerSideJavaScript echoScript = new ExecutableMongoScript("function(x) { return x; }");
+scriptOps.execute(echoScript, "directly execute script");
+
+scriptOps.register(new CallableMongoScript("echo", echoScript));
+scriptOps.call("echo", "execute script via name");
+----
+
+
 [[mongo.group]]
 == Group Operations