Ugrade to Maven AspectJ Plugin 1.4

** Bug 
    * [MASPECTJ-102] - NullPointerException when running under m2e 1.0 
    * [MASPECTJ-103] - Empty <classifier> in <aspectLibrary> cause error 

** Improvement 
    * [MASPECTJ-91] - Mark aspectj plugin as @threadSafe if possible 
    * [MASPECTJ-95] - sourceDirectory and testSourceDirectory params are 
required 
    * [MASPECTJ-96] - configurable option to skip execution 
    * [MASPECTJ-100] - Add support resource bundles for the report 

** New Feature 
    * [MASPECTJ-9] - Add support for weaving classes in folders instead 
of jars 

** Task 
    * [MASPECTJ-104] - Update to AspectJ 1.6.11 
    * [MASPECTJ-105] - Upgrade minimum required Maven version to 2.2.0