add a remove method to unset a declaration block from a list

[docteurklein]

No description provided.

[sabberworm]

I had to modify your code a little bit: not all elements in a CSSList are CSSDeclarationBlocks and therefore not all have a method named getSelectors(). In addition, users might want to remove elements other than declaration blocks from the list. To get your desired behaviour, use the new method removeDeclarationBlockBySelector. You may pass a string, an array of strings, a CSSSelector, an array of CSSSelectors or a CSSDeclarationBlock whose selector will be used.

[docteurklein]

thanks a lot! It was a quick and dirty fix.