1. ADDED: Rewrote Accept-Language header parsing.
2. ADDED: Cache-Control header parsing.
3. ADDED: Pragma header parsing.
4. ADDED: Range header parsing.
5. ADDED: Content-Range header parsing.
6. CLEANUP: Rewrote HTTP date grammar.
7. ADDED: HTTP range units.
8. CLEANUP: Started reordering the HTTP header modules.