Add variables to control global python and ruby environment so nvim works in environments too

neovim/.config/nvim/init.vim

@@ -95,6 +95,11 @@ augroup END
 " autocmd FileType go  setlocal listchars=tab:\ \ ,trail:·,extends:›,precedes:‹,nbsp:␣
 "augroup END
 
+" define global python
+let g:python_host_prog="/usr/bin/python2"
+let g:python3_host_prog="/usr/bin/python"
+let g:ruby_host_prog="/usr/bin/ruby"
+
 " define markdown extensions
 let g:vimwiki_ext2syntax = {'.md': 'markdown', '.markdown': 'markdown', '.mdown': 'markdown'}