Refactoring how listeners are sorted.. Need to benchmark.
Added a simple benchmark.
Merge branch 'master' into sort-refactor
Slightly faster.
Using multisort.
Merge pull request #2 from fruux/sort-refactor

Sort refactor
Updating changelog.
Merge branch 'sort-refactor'
psr-4 directory layout.
Adding hhvm-nightly and php 5.6.
Merge branch 'master' into continue-callback

Conflicts:
	lib/EventEmitterTrait.php
Updated changelog