exp/norm: API for normalization library.
exp/norm: API for normalization library.

R=r, r, mpvl, rsc
CC=golang-dev
http://codereview.appspot.com/4678041

Committer: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

scirelli/scirelli-go,d0f/go-zh,glycerine/jeaten-go-arrayof-structof,bryanxu/go-zh,rflanagan/reginaldflanagan-project1,mhennings/marcohennings-go,bryanxu/go-zh,rdp/rogerpack2005-golang,Triskite/willstone-goclone,bryanxu/go-zh,scirelli/scirelli-go,scirelli/scirelli-go,sanjosh/sanjos100-tipc,bryanxu/go-zh,rdp/rogerpack2005-golang,glycerine/jeaten-go-arrayof-structof,Triskite/willstone-goclone,d0f/go-zh,npe9/noahevans-go9,npe9/noahevans-go9,webfd/go-zh,bryanxu/go-zh,rdp/rogerpack2005-golang,npe9/noahevans-go9,Triskite/willstone-goclone,glycerine/jeaten-go-arrayof-structof,scirelli/scirelli-go,webfd/go-zh,mhennings/marcohennings-go,rflanagan/reginaldflanagan-project1,d0f/go-zh,webfd/go-zh,rdp/rogerpack2005-golang,rflanagan/reginaldflanagan-project1,Triskite/willstone-goclone,d0f/go-zh,scirelli/scirelli-go,npe9/noahevans-go9,sanjosh/sanjos100-tipc,bryanxu/go-zh,sanjosh/sanjos100-tipc,bryanxu/go-zh,scirelli/scirelli-go,sanjosh/sanjos100-tipc,glycerine/jeaten-go-arrayof-structof,npe9/noahevans-go9,sanjosh/sanjos100-tipc,sanjosh/sanjos100-tipc,mhennings/marcohennings-go,scirelli/scirelli-go,rdp/rogerpack2005-golang,npe9/noahevans-go9,glycerine/jeaten-go-arrayof-structof,webfd/go-zh,glycerine/jeaten-go-arrayof-structof,d0f/go-zh,rflanagan/reginaldflanagan-project1,mhennings/marcohennings-go,glycerine/jeaten-go-arrayof-structof,sanjosh/sanjos100-tipc,d0f/go-zh,Triskite/willstone-goclone,mhennings/marcohennings-go,webfd/go-zh,sanjosh/sanjos100-tipc,rflanagan/reginaldflanagan-project1,mhennings/marcohennings-go,rflanagan/reginaldflanagan-project1,Triskite/willstone-goclone,glycerine/jeaten-go-arrayof-structof,rdp/rogerpack2005-golang,bryanxu/go-zh,rdp/rogerpack2005-golang,rflanagan/reginaldflanagan-project1,npe9/noahevans-go9,Triskite/willstone-goclone,d0f/go-zh,d0f/go-zh,webfd/go-zh,Triskite/willstone-goclone,mhennings/marcohennings-go,rdp/rogerpack2005-golang,mhennings/marcohennings-go,scirelli/scirelli-go,webfd/go-zh,webfd/go-zh,npe9/noahevans-go9,rflanagan/reginaldflanagan-project1