v4.1.0

• Allow triggers on events which gives a powerful way to modify behaviour (Tim Brody @timbrody, Dan Dascalescu, Paul Evans @leonerd, Jens Rehsack @rehsack Dean Hamstead @djzort)
• Put documentation in about behaviour under blib and test, allow searching outside blib under test (suggestion from Stephen Baynes @sbaynes)
• Made following symlinks the default behaviour, added ability to turn that off (Aran Deltac @bluefeet)
• Fix installation path (Matthias Dietrich @rainboxx, Todd Rinaldo @toddr)
• Allow min_depth and max_depth (as per suggestion from Jens Rehsack @rehsack)
• Set our @inc up to include and prefer our search_dirs if necessary (as per suggestion from Ian Goodacre @ig3)
• Switch to Module::Build