Ensure that DOCTYPE from the input is used in the output of DomSerializer; thanks to Vincent Massol for the patch. See issue #27

git-svn-id: svn+ssh://svn.code.sf.net/p/htmlcleaner/code/trunk@245 482c6979-392e-0410-9d6c-a8d33d214f2b
Removed debug code

git-svn-id: svn+ssh://svn.code.sf.net/p/htmlcleaner/code/trunk@246 482c6979-392e-0410-9d6c-a8d33d214f2b
Added test case for issue #67

git-svn-id: svn+ssh://svn.code.sf.net/p/htmlcleaner/code/trunk@247 482c6979-392e-0410-9d6c-a8d33d214f2b
Merge branch 'master' into github_master