fix enum drop bug as indicated by @mickhansen on irc

lib/query-interface.js

@@ -308,7 +308,8 @@ module.exports = (function() {
       .success(function (results) {
         results.forEach(function (result) {
           chainer.add(self.sequelize.query(
-            self.QueryGenerator.pgEnumDrop(null, null, result.enum_name),
+            self.QueryGenerator.pgEnumDrop(null, null, self.QueryGenerator.pgEscapeAndQuote(result.enum_name)),
+            // self.QueryGenerator.pgEnumDrop(null, null, result.enum_name),
             null,
             {logging: options.logging, raw: true}
           ))