Rename Entry class in TreeMap

The name "Entry" was hiding interface Map.Entry so code
that did stuff like :

  TreeMap.Entry<K, V> foo : map.entrySet()

would break. Moreover, that naming scheme confusing (with
interface Map.Entry, class TreeMap.Entry) and this change
(IMO) improves readability

Change-Id: Ieb9d8c40f2d354dc8a66daf1649946168aa35831
1 file changed