Remove mapleader change
Update Vundle
Bug fix in `.vimrc`

`background` overrides `colorscheme`. So it should either be removed
or placed before `colorscheme`. I've removed it.
Update `.vimrc`

`showmode` is on by default in Vim.
Vimrc update: use `FileType` event, not `Syntax`

Sometimes `Syntax` is turned off, but `FileType` never is.