Listener<T> that exposes Func for matcher

Fixes #104. Allows low-level "should this Listener run?" decisions.
Merge remote-tracking branch 'upstream/master'
Updated mmbot packages.config to match MMBot.Core

mmbot still referenced ScriptCs 0.8.1. MMBot.Core was changed to 0.9.0.
Merge remote-tracking branch 'upstream/master'
Merge pull request #115 from Spksh/master

Listener<T> that exposes Func for matcher