separate vimrc into vimrc (basic configuration) and vimrc.bundles (plugin configuration).
this is useful when you want to use vim with minimal configuration and so on.
change file name from _vimrc to .vimrc in install.bat
comment out default status line in vimrc because it uses fugitive.
create batch file for uninstallation.
it removes the files created by install.bat.
create shell script for uninstallation.
it removes the files created by install.sh.
add ctags and vimrc.bundles to install.sh and uninstall.sh.