Merchant shop fixes

Changed reactions to produce stacks of 500 coins.
Fixed the Blackpowder/dynomite reactions
Corrected the "Sell megabeast soul for 5000 sovereigns" to say 10000
since that his how many it produces and seems to be appropriate.
Orc merchant fixes

Oops forgot to fix the coin stacks on them
Merge pull request #52 from BillyJackDF/master

Merchant shop fixes courtesy of BillyJack

References GH #35.