improved sentence extraction: - don't forget first periods - look at capitalization of last char before periods
improved sentence extraction:
- don't forget first periods
- look at capitalization of last char before periods

R=rsc
http://go/go-review/1024027

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