Tool for finding problem interceptors

_From [limpbizkit](https://code.google.com/u/limpbizkit/) on December 29, 2008 14:35:04_

It would be handy if there were a tool that could inspect an Injector and report broken interceptors.
For example, suppose the user's interceptor matches methods annotated with `@`Transactional.
When that annotation is applied to a private method, that's likely to be an error.

A trivial tool would just detect if any matcher matched non-interceptable (private, final etc.)
methods.

It would also be handy to check if equals(), hashCode() or toString() were matched, which often
indicates a programming error.

_Original issue: http://code.google.com/p/google-guice/issues/detail?id=294_