[vimrc] Remove ``riv.vim`` plugin
Merge remote-tracking branch 'origin/vimrc' into vimrc
Merge branch 'vimrc'
[.zshrc.prompt] refine dir stack, use POSIX way
[.zshrc.prompt] refine git info, check git existance and stash counts
[rst.vim] seperate "bullet level check" into another function
Merge branch 'rst.vim'
Merge branch 'zshrc'
Merge branch 'master' into develop