Add bufexplorer's configs
Use key U to replace F6 for Gundo
Disable cursorline in VIM
Update .vimrc
Vim: Plug-in: Buffergator
Add Buffergator's config
Update .vimrc
Temporarily disable cscope plug-in
Vim: Plug-in: togglelist.vim
Update .vimrc
Revert "Add Buffergator's config"

This reverts commit e43709d20725bbfa2873528a8760786d05f46303.
Revert "Vim: Plug-in: Buffergator"

This reverts commit 76b200873edd57b4c5ef1d73eb78bfafc3c56c1d.