Option to not keep track of collections

[jagill]

Ideally, the node-ddp-client would be as simple as possible, and not try to keep track of the ddp collections. Keeping track of collections could be another library that encapsulates the raw ddp client. In particular, for our use case we need to keep track of some collections in a more structured way, and some subscriptions don't correspond to a collection at all. Thus the collections in ddp-client are just wasted memory for me.

What do you guys think of a PR that gives an option to disable the collections in ddp-client?

[emgee3]

I'm fine on this as long as it defaults to original behavior.