Malformed <Relationship> Node When Merging Documents (affects merging documents with images)

[aw3as]

In def self.merge_documents, when attaching a new Relationship node (new_rel_node = "<Relationship Id=#{new_id} Type=#{node["Type"]} Target=#{target_val} />"), Nokogiri will attempt to fix the XML and in the process lowercase all of the attributes, resulting in a corrupt word/_rels/document.xml.rels (e.g. <relationship id="rId101" type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/image" target="media/image101.png"/>).

Proposed solution would be to either properly escape new_rel_node, e.g. new_rel_node = "<Relationship Id=\"#{new_id}\" Type=\"#{node["Type"]}\" Target=\"#{target_val}\" />", or to use Nokogiri::XML::Node.new to properly create the node