DATADOC-78: Refactored some of the code to use a new MappingContextAware interface available in spring-data-commons-core for obtaining a reference to the active MappingContext. Also added proper configuration to the namespace handler. Also tweaked the docs slightly.

src/docbkx/reference/mapping.xml

@@ -23,8 +23,6 @@
            http://www.springframework.org/schema/data/mongo http://www.springframework.org/schema/data/mongo/spring-mongo-1.0.xsd
            http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
 
-<beans>
-
   <!-- Default bean name is 'mongo' -->
   <mongo:mongo host="localhost" port="27017"/>