Lion's shield fixes

* Respect physical damage resistance.
* Do not print "the dead ...".
Fix robe of the dead mage description

It didn't mention the +1 defence bonus.
Monty Hall fixes

* Taking -> opening
* Understand "choose" as a mistake.
* Fix a spelling error.
* Make sure we're only running the rules for chests, not carried
containers. (They don't exist. Yet!)

Closes #135.