LRU manager by number of key (as opposed to current sum of values)

[pkieltyka]

Should be able to support both.. current interface is: New(capacity int64, *anotherStore chainstore.Store) .. maybe we should make it New("500MB", store) or New("500 items", store) .. using a simple string?

or multiple .New() methods would do it as well.. .NewValueCapacity() and default .New() is to manage capacity by number of keys