Remove NCM config

No longer maintained:
roxma/nvim-completion-manager#12 (comment)

vim/plugins/autocomplete.vim

@@ -1,54 +1,32 @@
 if has('nvim')
   Plug 'Shougo/deoplete.nvim', { 'do': ':UpdateRemotePlugins' }
-  Plug 'roxma/nvim-completion-manager', { 'do': ':UpdateRemotePlugins' }
 else
   Plug 'Shougo/deoplete.nvim'
-  Plug 'roxma/nvim-completion-manager', { 'do': ':UpdateRemotePlugins' }
   Plug 'roxma/nvim-yarp'
   Plug 'roxma/vim-hug-neovim-rpc'
 endif
 
 Plug 'Shougo/echodoc.vim'
 
-function UseNCM()
-  set completeopt-=preview " get rid of vim complete window. Never used it, don't need it.
-  inoremap <expr><C-n> pumvisible() ? "\<C-n>" :
-        \ <SID>check_back_space() ? "\<TAB>" :
-        \ cm#_force_refresh()
-  function! s:check_back_space() abort "{{{
-    let col = col('.') - 1
-    return !col || getline('.')[col - 1]  =~ '\s'
-  endfunction"}}}
-endfunction
+inoremap <expr><C-n> pumvisible() ? "\<C-n>" :
+      \ <SID>check_back_space() ? "\<TAB>" :
+      \ deoplete#mappings#manual_complete()
+function! s:check_back_space() abort "{{{
+  let col = col('.') - 1
+  return !col || getline('.')[col - 1]  =~ '\s'
+endfunction"}}}
 
-" deoplete
-function UseDeoplete()
-  inoremap <expr><C-n> pumvisible() ? "\<C-n>" :
-        \ <SID>check_back_space() ? "\<TAB>" :
-        \ deoplete#mappings#manual_complete()
-  function! s:check_back_space() abort "{{{
-    let col = col('.') - 1
-    return !col || getline('.')[col - 1]  =~ '\s'
-  endfunction"}}}
 
+" no new line after hitting enter
+inoremap <silent><expr><CR> pumvisible() ? deoplete#mappings#close_popup() : "\<CR>"
 
-  " no new line after hitting enter
-  inoremap <silent><expr><CR> pumvisible() ? deoplete#mappings#close_popup() : "\<CR>"
 
+" Use partial fuzzy matches like YouCompleteMe
+au VimEnter * call deoplete#custom#set('_', 'matchers', ['matcher_fuzzy'])
+au VimEnter * call deoplete#custom#set('_', 'converters', ['converter_remove_paren'])
+au VimEnter * call deoplete#custom#set('_', 'disabled_syntaxes', ['Comment', 'String'])
 
-  " Use partial fuzzy matches like YouCompleteMe
-  au VimEnter * call deoplete#custom#set('_', 'matchers', ['matcher_fuzzy'])
-  au VimEnter * call deoplete#custom#set('_', 'converters', ['converter_remove_paren'])
-  au VimEnter * call deoplete#custom#set('_', 'disabled_syntaxes', ['Comment', 'String'])
-
-  let g:deoplete#enable_at_startup = 1
-  let g:deoplete#ignore_sources = {}
-  let g:deoplete#ignore_sources._ = ['member', 'tag', 'neosnippet']
-  let g:deoplete#auto_complete_delay = 0
-endfunction
-
-"call UseDeoplete()
-call UseNCM()
-
-:command UseDeoplete call UseDeoplete()
-:command UseNCM call UseNCM()
+let g:deoplete#enable_at_startup = 1
+let g:deoplete#ignore_sources = {}
+let g:deoplete#ignore_sources._ = ['member', 'tag', 'neosnippet']
+let g:deoplete#auto_complete_delay = 0