Allow for disabling individual languages, closes #66

syntax/html/rdfa.vim

@@ -1,3 +1,5 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'html5') == -1
+  
 " Vim syntax file
 " Language:     RDFa
 " Maintainer:   othree <othree@gmail.com>
@@ -9,3 +11,5 @@
 " RDFa
 " http://www.w3.org/TR/rdfa-syntax/#s_syntax
 syn keyword htmlArg contained about content datatype href inlist prefix property rel resource rev src typeof vocab
+
+endif