~/.vimrc: elm and go support, nerdtree

.vimrc

@@ -34,6 +34,9 @@ if isdirectory($HOME . '/.vim/bundle/vundle')
	let g:goyo_callbacks = [function('s:goyo_before'), function('s:goyo_after')]
	Bundle 'flazz/vim-colorschemes'
	Bundle 'lambdatoast/elm.vim'
	Bundle 'fatih/vim-go'
	Bundle 'scrooloose/nerdtree'
endif
if isdirectory($HOME . '/t/rust/src/etc/vim')