Move Cursor and TokenBuffer into buffer module
diff --git a/src/error.rs b/src/error.rs
index eddb33f..4241d1c 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -7,7 +7,7 @@
 // except according to those terms.
 
 use std::error::Error;
-use cursor::Cursor;
+use buffer::Cursor;
 use std::fmt::{self, Display};
 
 /// The result of a parser