Better tab behaviour in deoplete, still not as nice as YCM

.vimrc

@@ -295,6 +295,16 @@ Plugin 'zchee/deoplete-jedi'
 Plugin 'Shougo/neco-syntax'
 
 let g:deoplete#enable_at_startup = 1
+
+" Enable tab complete
+function! s:check_back_space() abort "{{{
+  let col = col('.') - 1
+  return !col || getline('.')[col - 1]  =~ '\s'
+endfunction"}}}
+inoremap <silent><expr> <TAB>
+      \ pumvisible() ? "\<C-n>" :
+      \ <SID>check_back_space() ? "\<TAB>" :
+      \ deoplete#manual_complete()
 endif