add preferences to schema (we'll later want to run a mongo migration

to move many random variables into user.preferences, such as the
'flags' document)

src/app/schema.coffee

@@ -9,6 +9,7 @@ module.exports.userSchema = ->
     balance: 2
     stats: { money: 0, exp: 0, lvl: 1, hp: 50 }
     items: { itemsEnabled: false, armor: 0, weapon: 0 }
+    preferences: { gender: 'm', armorSet: 'v1' }
     tasks: {}
     habitIds: []
     dailyIds: []