Excute callback in the context of attached object.
Version 1.0.2
Clean.
Upate test for async version.
Version 1.1.0
Return eventy itself if call it directly.
Add global uses in README.
Version 1.1.1
Tricky.
Version 1.1.2
Fix global uses.
Version 1.1.3
Remove requiring version from package.json
Make this package as a component