Add neobundle#begin()/neobundle#end()

Replace `neobundle#rc()` by `neobundle#begin` to remove the error message on startup.

But, the second commit is to move the colorscheme, if I didn't do so, vim will notify that no colorscheme named XXXX if I define the colorscheme in `g:dotvim_settings` , so I'm not sure whether replacing `neobundle#rc()`  needs more modification...