Start kuchevo implementation.
It's compiling.
Rename.
Add kuchest
Impelement Kuchevo using Rc
Using generics.
Implement inserting.
Implement erasing.
Add Persisten Map structure.
Improve switch to specific revision from O(N) to O(lg(N)) in FatNode
Pre.
Generics for Persistent Map
Merge pull request #2 from zaic/pers-kuchevo

Persistent Set