Updated copy-constructors and id to several classes...
Merge branch 'master' of https://github.com/faern/book-a-hobbit into can_i_see_your_id
More work on id and copy constructors
Merge branch 'master' of https://github.com/faern/book-a-hobbit into can_i_see_your_id
... (can't remember)
Merge branch 'master' into can_i_see_your_id
Changed the way id's are handled.
added copy to guest
Merge branch 'master' of https://github.com/faern/book-a-hobbit