Fix invalid shift mask constant
Luvia mob skill: prevent infinite slave spawn:

  Add a high cap for the Witch Guard and Demonic Spirit spawned regularly.
Reordered Warp Towel Checks to disable using multiple towels early
Fix Buy/Sell Price of Towels to be Zero
People will make towels for no reason other than to make towels...
Merge pull request #97 from wushin/warp-towel-fix

Warp Towel Fixes
Merge remote-tracking branch 'Void/luvia-mob-skill'
Dialogue changes to NPCs
Improved the dialogue of the bookshelf containing "zukminbirf."
Added "croupier" name tag to the Roulette NPC's dialog
Improved grammar and wording
Replaced ". " with ". "
Replaced " -- " with an en dash (" – ").
News and Submodule update for v2014.5.6