[sessions] Add session.Delete()

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Add a convenience function that sets the session cookie to be deleted, since 
this is so common.

It could be called session.Delete() or something more along the lines of 
session.IssueDeletion(), since Save() still needs to be called after it.

Currently to delete a session, you need to do:

   // ...
   session.Options = &sessions.Options{MaxAge: -1}
   session.Save(r, w)

Original issue reported on code.google.com by rodrigo.moraes on 3 May 2012 at 12:14

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Also may be good to add ability to delete session from store (filestore/mongodb 
and others). 

Original comment by v...@selfip.ru on 18 Jun 2012 at 2:07

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[deleted comment]

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It could be session.Clear()

Original comment by fio...@gmail.com on 6 Apr 2013 at 7:54

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By the way, one might also set the Path to delete the cookie:

    session.Options = &sessions.Options{MaxAge: -1, Path: "/"}

Or use net/http directly:

    http.SetCookie(w, &http.Cookie{Name: "sess", MaxAge: -1, Path: "/"})

Original comment by fio...@gmail.com on 8 Apr 2013 at 8:59

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I would vote for Destroy() since "Destroy" is on par with session lingo

Original comment by styler1...@gmail.com on 23 Jul 2014 at 4:40

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I agree, it should be easier to destroy a session.

Original comment by tsrwe...@gmail.com on 26 Jul 2014 at 11:53