Bugfix & compatibility enhancement

[billychow]

• Fixed compatibility with PHP 5.2 which doesn't support late static binding
• To force DOMDocument load by UTF-8 (dirty fix)
• Remove redundant libxml error

[chrismcmacken]

If you can resolve that one comment then I'll test this and pull it in.

[billychow]

I've tried, but it's not working as we expected.
So I just google it and found a dirty fix to set encoding to utf-8 explicitly.

refer to: http://www.php.net/manual/en/domdocument.loadhtml.php

[chrismcmacken]

On second thought, we can't hard code this as UTF-8. If there's another encoding in use we don't want to import it as UTF-8. We should find the encoding from the document that we're parsing, if there isn't one it should default to ISO-8859-1 as the HTTP 1.1 spec says that's what the default should be.

It looks like this is going to be a little bit bigger than the simple fix proposed above.