Highlight respond_with

Author: tpope

autoload/rails.vim

@@ -3529,7 +3529,7 @@ function! s:BufSyntax()
         endif
       elseif buffer.type_name('controller')
         syn keyword rubyRailsControllerMethod helper helper_attr helper_method filter layout url_for serialize exempt_from_layout filter_parameter_logging hide_action cache_sweeper protect_from_forgery caches_page cache_page caches_action expire_page expire_action rescue_from
-        syn keyword rubyRailsRenderMethod render_to_string redirect_to head
+        syn keyword rubyRailsRenderMethod head redirect_to render_to_string respond_with
         syn match   rubyRailsRenderMethod '\<respond_to\>?\@!'
         syn keyword rubyRailsFilterMethod before_filter append_before_filter prepend_before_filter after_filter append_after_filter prepend_after_filter around_filter append_around_filter prepend_around_filter skip_before_filter skip_after_filter
         syn keyword rubyRailsFilterMethod verify