MySQL: Unique key index column names now quoted

https://github.com/sequelize/sequelize/issues/1753

lib/dialects/mysql/query-generator.js

@@ -25,6 +25,8 @@ module.exports = (function() {
         charset: null
       }, options || {})
 
+      var self = this;
+
       var query   = "CREATE TABLE IF NOT EXISTS <%= table %> (<%= attributes%>)<%= comment %> ENGINE=<%= engine %> <%= charset %> <%= collation %>"
         , primaryKeys = []
         , foreignKeys = {}
@@ -68,7 +70,13 @@ module.exports = (function() {
 
       if (!!options.uniqueKeys) {
         Utils._.each(options.uniqueKeys, function(columns) {
-          values.attributes += ", UNIQUE uniq_" + tableName + '_' + columns.fields.join('_') + " (" + columns.fields.join(', ') + ")"
+          values.attributes += ", UNIQUE uniq_" + tableName + '_' + columns.fields.join('_') + " (";
+          var i = 0;
+          Utils._.each(columns.fields, function(field) {
+            if(i++ > 0) values.attributes += ", ";
+            values.attributes += self.quoteIdentifier(field);
+          });
+          values.attributes += ")";
         })
       }