Added extended templates

[garbados]

I added four new snippets, labelled backbone.[type].extended, that add the indicated type of object (model, view, etc.) with some basic attributes, such as initialize or render, already fluffed up.

What do you think?

[tomasztunik]

thinking about how common it is to use all these properties, I find myself using the initialize, defaults or events as a method rather then just an object actually less often then not using them at all and thinking if in spite of that we should make the package more bulky - what do you think? anybody else got idea what would be best way to push that?

[garbados]

I'd be happy to change the templates to return methods instead of objects. That adds functionality without diminishing the use cases the templates serve (so far as I know).

Ideally, these templates should save you from writing initialize and render over and over and over for everything new you make. That's huge for me; how often do you use just the bare templates without adding those same fields?

[tomasztunik]

@garbados I had another look at it and I actually tend to lean toward adding these - what do you think if we tried to wrap the optional methods in variables/placeholers so that they would get hilighted so if not needed you could easily remove them? would need to try if it's doable to add multiline placeholders ${n:placeholder} - could you also update readme?

[garbados]

Sure thing. I'll try out the changes and recommit shortly.