Add syntax files from upstream vim repository

ftplugin/htmldjango.vim

@@ -0,0 +1,17 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1
+  
+" Vim filetype plugin file
+" Language:	Django HTML template
+" Maintainer:	Dave Hodder <dmh@dmh.org.uk>
+" Last Change:	2007 Jan 25
+
+" Only use this filetype plugin when no other was loaded.
+if exists("b:did_ftplugin")
+  finish
+endif
+
+" Use HTML and Django template ftplugins.
+runtime! ftplugin/html.vim
+runtime! ftplugin/django.vim
+
+endif