Updated plugins and added vim-markdown

sources_non_forked/vim-go/scripts/test

@@ -69,7 +69,7 @@ find "$vimgodir" -name '*_test.vim' | while read test_file; do
   "$vimgodir/scripts/run-vim" $coverage $vim -e \
     +"silent e $test_file" \
     +"let g:test_verbose=$verbose" \
-    -S ./scripts/runtest.vim || (
+    -S ./scripts/runtest.vim < /dev/null || (
       # If Vim exits with non-0 it's almost certainly a bug in the test runner;
       # should very rarely happen in normal usage.
       echo 'test runner failure'