Merge pull request #29 from Marwes/detach_undo_log

feat: Allow the UndoLog to be supplied separately

Author: nikomatsakis

src/lib.rs

@@ -20,4 +20,5 @@ extern crate log;
 extern crate dogged;
 
 pub mod snapshot_vec;
+pub mod undo_log;
 pub mod unify;