renamed sources_non_forked folder to bundle

bundle/vim-airline/autoload/airline/extensions/virtualenv.vim

@@ -0,0 +1,20 @@
+" MIT License. Copyright (c) 2013-2014 Bailey Ling.
+" vim: et ts=2 sts=2 sw=2
+
+if !get(g:, 'virtualenv_loaded', 0)
+  finish
+endif
+
+let s:spc = g:airline_symbols.space
+
+function! airline#extensions#virtualenv#init(ext)
+  call a:ext.add_statusline_func('airline#extensions#virtualenv#apply')
+endfunction
+
+function! airline#extensions#virtualenv#apply(...)
+  if &filetype =~ "python"
+    call airline#extensions#append_to_section('x',
+          \ s:spc.g:airline_right_alt_sep.s:spc.'%{virtualenv#statusline()}')
+  endif
+endfunction
+