exp/html: when parsing, compare atoms (ints) instead of strings.
exp/html: when parsing, compare atoms (ints) instead of strings.

This is the mechanical part of the 2-part change that started with
http://codereview.appspot.com/6305053/

R=rsc
CC=andybalholm, golang-dev, r
http://codereview.appspot.com/6295055

bryanxu/go-zh,sanjosh/sanjos100-tipc,rflanagan/reginaldflanagan-project1,d0f/go-zh,d0f/go-zh,rflanagan/reginaldflanagan-project1,sanjosh/sanjos100-tipc,rdp/rogerpack2005-golang,glycerine/jeaten-go-arrayof-structof,scirelli/scirelli-go,sanjosh/sanjos100-tipc,glycerine/jeaten-go-arrayof-structof,scirelli/scirelli-go,scirelli/scirelli-go,rflanagan/reginaldflanagan-project1,mhennings/marcohennings-go,rdp/rogerpack2005-golang,rflanagan/reginaldflanagan-project1,rflanagan/reginaldflanagan-project1,scirelli/scirelli-go,rdp/rogerpack2005-golang,glycerine/jeaten-go-arrayof-structof,sanjosh/sanjos100-tipc,rflanagan/reginaldflanagan-project1,mhennings/marcohennings-go,sanjosh/sanjos100-tipc,mhennings/marcohennings-go,d0f/go-zh,rflanagan/reginaldflanagan-project1,webfd/go-zh,mhennings/marcohennings-go,webfd/go-zh,glycerine/jeaten-go-arrayof-structof,bryanxu/go-zh,mhennings/marcohennings-go,bryanxu/go-zh,glycerine/jeaten-go-arrayof-structof,Triskite/willstone-goclone,bryanxu/go-zh,Triskite/willstone-goclone,mhennings/marcohennings-go,Triskite/willstone-goclone,rflanagan/reginaldflanagan-project1,Triskite/willstone-goclone,webfd/go-zh,Triskite/willstone-goclone,bryanxu/go-zh,d0f/go-zh,glycerine/jeaten-go-arrayof-structof,bryanxu/go-zh,Triskite/willstone-goclone,glycerine/jeaten-go-arrayof-structof,rdp/rogerpack2005-golang,Triskite/willstone-goclone,rdp/rogerpack2005-golang,bryanxu/go-zh,webfd/go-zh,d0f/go-zh,bryanxu/go-zh,scirelli/scirelli-go,webfd/go-zh,Triskite/willstone-goclone,sanjosh/sanjos100-tipc,webfd/go-zh,webfd/go-zh,scirelli/scirelli-go,d0f/go-zh,sanjosh/sanjos100-tipc,rdp/rogerpack2005-golang,scirelli/scirelli-go,d0f/go-zh,sanjosh/sanjos100-tipc,mhennings/marcohennings-go,webfd/go-zh,rdp/rogerpack2005-golang,scirelli/scirelli-go,mhennings/marcohennings-go,glycerine/jeaten-go-arrayof-structof,d0f/go-zh,rdp/rogerpack2005-golang