Support svg:foreignObject

Fixes to the html5lib sanitizer and maruku to support the SVG <foreignObject> element.
Also update to the latest REXML.

vendor/plugins/rexml/lib/rexml/element.rb

@@ -990,7 +990,9 @@ module REXML
     end
 
     def to_a
-      values.flatten
+      attributes = []
+      each_attribute {|attr| attributes << attr}
+      attributes
     end
 
     # Returns the number of attributes the owning Element contains.

vendor/plugins/rexml/lib/rexml/formatters/default.rb

@@ -63,7 +63,7 @@ module REXML
       def write_element( node, output )
         output << "<#{node.expanded_name}"
 
-        node.attributes.to_a.sort_by {|attr| attr.name}.each do |attr|
+        node.attributes.to_a.sort_by {|attr| attr.expanded_name}.each do |attr|
           output << " "
           attr.write( output )
         end unless node.attributes.empty?

vendor/plugins/rexml/lib/rexml/formatters/pretty.rb

@@ -128,7 +128,9 @@ module REXML
       def wrap(string, width)
         # Recursivly wrap string at width.
         return string if string.length <= width
-        place = string.rindex(' ', width) # Position in string with last ' ' before cutoff
+        place = string.rindex(/\s/, width) # Position in string with last ' ' before cutoff
+        place = string.index(/\s/) if place.nil? # Otherwise first space
+        return string if place.nil? # otherwise, whole string
         return string[0,place] + "\n" + wrap(string[place+1..-1], width)
       end