Use namespaced enum variants for the map-entry slots.
Do not re-export the `Entry` enum ...

A minor [breaking-change] as downstream users will have to import the variants
themselves, or prefix the variant with the Entry enum's namespace.
Merge pull request #14 from drbawb/feature/namespaced-enums

Use namespaced enum variants for HashMap `Entry`s
0.9.4
A AnyMap that satisfies Clone.