Repair a couple of privacy warnings.

Author: chris-morgan

src/codegen/branchify.rs

@@ -3,7 +3,7 @@
 use std::str::Chars;
 use std::io::IoResult;
 
-struct ParseBranch {
+pub struct ParseBranch {
     matches: ~[u8],
     result: Option<~str>,
     children: ~[ParseBranch],

src/http/headers/mod.rs

@@ -151,7 +151,7 @@ pub struct HeaderValueByteIterator<'a, R> {
     next_byte: Option<u8>,
 
     at_start: bool,
-    state: HeaderValueByteIteratorState,
+    priv state: HeaderValueByteIteratorState,
 }
 
 impl<'a, R: Reader> HeaderValueByteIterator<'a, R> {