3.1.2
* Removed css builder
3.1.3
* suppress warning while undefining object_id
3.1.4
* explicit blank content will not generate a self-closing tag
3.2.0
* Check if method was already cached before method definition.
* Change to String, raise_error last argument accept String
* Add test
* Cleanup of code
* Make changes to add option
* Update lib/builder/xmlbase.rb
* Cleaned up test case.
* Cleaned up explicit nil code a wee bit.
* Remove extraneous white spaces.
* Convert readme from rdoc to markdown.
* Tweek readme.
* Add us-ascii encoding declaration.
* Use old style hash literals for 1.8.x compatibility.
* Add # encoding: iso-8859-1 comment
* Add single quote attribute option.
* Update changes.
* More rdoc fixes.
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