save skunk session manually if it holds objects other than primitive values

Hi,

I just found that if you save objects other than simple primitive values
(int, str, numbers, etc), but a dict, or perhaps other class instances into
session, and if you changed members of them, you have to manually call
session.save() before finish processing the request. I checked the
Session.py source code, and found that unless you update the session like
"session[xxx] = xxx" or "del session[xxx]", the session won't get 'dirty'.
That is, "session[xxx][xxx] = xxx" or "session[xxx].xxx = xxx" won't mark
the session 'dirty', thus it won't be saved.

This is OK for me, however, if my understand is correct, I suggest to add a
line in the document to explain this, so user won't be confused.

Regards

Bing Ren



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