Add neomake makers for pytest and tox

vim/rc/plugins/neomake.rc.vim

@@ -1,4 +1,13 @@
 Plug 'neomake/neomake'
 nnoremap <F5> :Neomake<CR>
-let g:neomake_python_enabled_makers = ['flake8']
 command! TagsUpdate NeomakeSh ctags -R .
+
+let g:neomake_python_enabled_makers = ['flake8']
+let g:neomake_python_pytest_maker = {
+    \ 'exe': 'py.test',
+    \ 'errorformat': &errorformat,
+    \ }
+let g:neomake_python_tox_maker = {
+    \ 'exe': 'tox',
+    \ 'errorformat': &errorformat,
+    \ }