[Seaside] Force lowercase for attributes

[Boris Popov]

XHTML's attribute names are all lower-case, so how about the following
change?

WAHtmlAttributes>>at: keyString put: valueString
  valueString ifNotNil: 
     [self attributes
           at: keyString asLowercase
           put: valueString]

By the way, I don't Squeak, otherwise I wouldn't have bothered the list
with it ;)

This ensure that code like,


-Boris

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