Removed the migration plugins.

server/levels/components/LevelComponent.coffee

@@ -12,7 +12,6 @@ LevelComponentSchema.plugin plugins.PermissionsPlugin
 LevelComponentSchema.plugin plugins.VersionedPlugin
 LevelComponentSchema.plugin plugins.SearchablePlugin, {searchable: ['name', 'description', 'system']}
 LevelComponentSchema.plugin plugins.PatchablePlugin
-LevelComponentSchema.plugin plugins.MigrationPlugin, {'language': 'codeLanguage'}
 
 LevelComponentSchema.pre 'init', (next) ->
   return next() unless jsonschema.properties?

server/levels/systems/LevelSystem.coffee

@@ -11,7 +11,6 @@ LevelSystemSchema.plugin(plugins.PermissionsPlugin)
 LevelSystemSchema.plugin(plugins.VersionedPlugin)
 LevelSystemSchema.plugin(plugins.SearchablePlugin, {searchable: ['name', 'description']})
 LevelSystemSchema.plugin(plugins.PatchablePlugin)
-LevelSystemSchema.plugin plugins.MigrationPlugin, {'language': 'codeLanguage'}
 
 LevelSystemSchema.pre 'init', (next) ->
   return next() unless jsonschema.properties?

server/plugins/plugins.coffee

@@ -9,7 +9,7 @@ module.exports.MigrationPlugin = (schema, migrations) ->
   # 1. Change the schema and the client/server logic to use the new name
   # 2. Add this plugin to the target models, passing in a dictionary of old/new names.
   # 3. Check that tests still run, deploy to production.
-  # 4. Run db.<collection>.update({}, { $rename: {'<oldname>':'<newname>'} }) on the server
+  # 4. Run db.<collection>.update({}, { $rename: {'<oldname>':'<newname>'} }, { multi: true }) on the server
   # 5. Remove the names you added to the migrations dictionaries for the next deploy
 
   schema.post 'init', ->