Move file to ./xmlserializer.js.

Package distributable with UMD header.

Bug fix

• Properly serialize CDATA sections from XML documents, #7

Correctly support namespace different namespaces of nested tags (#6).

Don't convert non-HTML tag names to lowercase (#5)

• Removes characters invalid in XML 1.0 from the source.
• Script and style elements are not embedded in CDATA sections anymore.

• Rename to xmlserializer with out the ".js"
• Fix dependencies

Serializes DOM trees to XML/XHTML. For Node.js and browsers (acting as replacement for XMLSerializer).