DATAMONGO-1045 - Tweak AspectJ setup in cross-store module to be able to build against Spring 4.1.

Added an aop.xml to only compile explicitly listed aspects in the cross-store module. This is needed as Spring 4.1 includes a new aspect for JavaEE 7 JCache support that has optional dependencies which we don't have in the classpath. Trying to compile all aspects contained in spring-aspects will result in ClassNotFoundExceptions for the aspects with missing dependencies.