convert pluses to spaces when decoding cookies

[hx]

This fix will let you set cookies with PHP's setcookie() method (and probably other languages too), and see spaces as spaces (previously they were plus signs).

[carhartl]

As I had stated somewhere else before, what if someone specifically wants to put a "+" into the cookie value? With this pull request this would be changed to " " upon reading (unless using raw), which is not desired obviously in such a case. That said, we cannot simply assume all pluses were having to change to " ".

My take on this is - now that we have default options, this is much easier - providing a decode option for this, so that the developer can hook whatever decoding method required into it:

$.cookie.defaults.decode = function(s) { return s.replace(/\+/g, ' '); };

This were all a developer needed to do.

[carhartl]

Alternatively we'd need to convert pluses first, before doing decodeURIComponent, as mentioned here: #13 (comment)

Would you like to adapt the pull request?

[carhartl]

My bad, I overlooked that you were already replacing before decoding... sorry.