Adding further filtering capabilities to JackrabbitEventFilter

[Michael Dürig]

Hi,
What do people think about adding further filtering capabilities to 
JackrabbitEventFilter? I was thinking of path exclusion and user data 
exclusion:

- Path exclusion would allow certain paths to be excluded from sending 
events. This is helpful if you want to listen to say /content but not to 
/content/foo. Relieving event handlers from handling such exclusions 
will lower client code complexity and increase performance.

- User data exclusions would allow for excluding events with certain 
user data. This could be useful if a session wants to bulk write some 
data without the respective event handlers being fired. That session 
would just need to set the user data to the same value as specified in 
the exclusion filter.

Michael