Allows to set "class" in cleanAttributes #50
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For being able to display properly the twitter widget in parsed articles, I need to set the class attribute of the blockquote as "clean", because the widget use it to know if it should display a twitter widget for the blockquote or not, for instance:
But even if i add "class" in "cleanAttributes" or if I disable the cleanAttribute setting the classes continue to be wiped because there is an earlier condition in the if block :
So if the attribute is named class it cannot be evaluated as a clean attribute or not, this PR fix that.