Self triggering events

I have a proposal to extend events binding syntax with following:

``` coffeescript
'change on @countrySelect!': ->
```

Event with `!` on the end of declaration, should be triggered right after binding.
This should be helpful for events like:

``` coffeescript
'resize on window!':->
@block.width $(window).width() / 2
```

or

``` coffeescript
'change on @countrySelect!': ->
@populateCitySelect(@countries[@countrySelect.val()].cities)
```

for quick setup initial values.