Updated auras, bugfixes for weapons and Spiteful Smith.

Now, when creating an aura, you must specify which players it applies to.
Moved setting active to the start of the turn, rather than the end.
Minions are no longer active at the end of their turns.
Added some missing Power tests
Implemented Arathi Weaponsmith
Implemented Warrior Hero Power
armour --> armor

To be consistent with the spelling in-game.
Merge remote-tracking branch 'origin/master'
Fix for auras, so they do not affect heroes.
Fix for auras, so they do not affect heroes, but really this time.
Merge issues