Add 'update' method about mapper HOT 2 CLOSED

Up to this point we've thought immutable properties as a huge advantage of using mapper. The other problem with this plan is the limitation on optional protocol methods. We definitely don't want to require Mappable types to be limited to those inheriting from NSObject, or in general touching the Objective-C runtime. Unless we had some very compelling reasons to add this I would prefer this be an extension/new protocol specific to your use case.

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As another thought on this. If you'd like that functionality where the majority of your properties will end up as var, you could implement a library that worked that way with a protocol that looked something like this:

protocol Mappable {
    init()
    func map(map: Mapper)
}

Then you could always use this map function to "fill" your objects. Before we switched to this library our internal library actually did that. I did a talk on mapper where I showed some examples of what that looked like if you're interested: https://realm.io/news/slug-keith-smiley-embrace-immutability/

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