Merge branch 'release/1.5.0' into develop
[CS] Kill mocha
[CS] Build on more rubies on Travis
Test on recent Ruby releases
[CS] Don't use deprecated rspec stuff
[CS] Ensure that handlers raising exceptions are dealt with correctly by default
[FEATURE] Add a broadcast mode to handler triggering

This ignores what happens in handlers (return value and exceptions) and unconditionally continues the handler chain.
[UPDATE] Bump to 1.6.0
[CS] Drop support for Ruby 1.9.2, test on Rubinius & ruby head with failures allowed
Merge branch 'release/1.6.0'