Fix possible DOS and small changes to timeouts

[laino]

By sending many upgrade event a client could possible create a lot of intervals without the old ones having a chance of being cleared. I also added the intervals to the constructor and made it use setImmediate instead of process.nextTick.

[laino]

Edit: Don't merge this yet. I'll create a new pull request.

[kapouer]

you don't have to create a new PR if you want to overwritethe commits
You can clone the repository locally, checkout your patch branch, commit --amend or reset HEAD^ then when you are done, commit and push -f. The PR will be updated.

[laino]

Ah right. I'll do that then. Thanks.

[rauchg]

Why do we have to initialize them as null ?

[laino]

Because that will a) make it clear to the programmer what kinds of attributes this class will have and b) improve performance because the VM will not have to change the internal class at runtime.

[laino]

Now I'm done.

[rauchg]

This broke 0.8 - reverting to process.nextTick

[laino]

Ah. I didn't know you're trying to be backwards compatible that far.

[rauchg]

There's a lot of people on 0.8 still