Update AspectJ to 1.8.8

Spring Roo 2.x uses Spring IO Platform to manage spring and third party dependencies.

Spring IO Platform provides the last version of AspectJ 1.8.8 as you could see on version appendix.

http://docs.spring.io/platform/docs/2.0.3.RELEASE/reference/htmlsingle/#appendix-dependency-versions

Update generated pom.xml to include last version of AspectJ and AspectJ Maven Plugin.