Update vimrc, see details below.

1, Removed mswin.vim out from vimrc, put it in
   the bundle folder.
2, Update the noautochdir behavior, no need to
   manually call noautochdir every time vim starts
   up in all operating systems.
3, Delete unused settings in vimrc.
4, Add shiftround
5, Change cscope's shortcut
6, Setup Grep's shortcut, comment out vimgrep
7, Change all map, nmap, to noremap, nnoremap etc.