integers to attr method causes server error

[roupen]

trying to do something like:

dom.find('body').attr('someattr',50) causes error. instead you have to:

dom.find('body').attr('someattr',50.to_s)

maybe have it always to_s?

Unexpected error while processing request: undefined method `include?' for 2810291:Fixnum

[cj]

probably related to #4