ff4j-aop was only able to proxy the first class (ordered by qualified
name) matching an interface with a @Flip method.

FeatureAutoProxy store a Map<String, Boolean> with Interface qualified
name as key and 'proxy enabled state' as value.
In order to prevent infinite loop, FeatureAdvisor now check if :
 - current bean name is equal to @Flip alterBean property
 - current class is equal to @Flip alterClazz property
This commit also include tests on alterClazz property.
Merge pull request #6 from Jdourd/aop-class-order-issue

ff4j-aop is only able to proxy the first class (ordered by qualified name) matching an interface with a @Flip method.