[PATCH] set expiry time for cookies

[gunark]

The attached patch makes it possible to set an expiry time for cookies.

For example:

@cookies[:foo] = {:value => "bar", :expires => Time.now + 1.hour}

The old simple way of setting cookies still works:

@cookies[:foo] = "bar"

[gunark]

Patch to allow cookie expiry

[judofyr]

This should work as expected in the coming Camping 2.0.