increment and decrement should use an object as second parameter

lib/dao.js

@@ -360,35 +360,65 @@ module.exports = (function() {
     }).run()
   }
 
-  DAO.prototype.increment = function(fields, count) {
-    var identifier = this.__options.hasPrimaryKeys ? this.primaryKeyValues : { id: this.id },
-      values = {}
+  DAO.prototype.increment = function(fields, countOrOptions) {
+    Utils.validateParameter(countOrOptions, Object, {
+      optional:           true,
+      deprecated:         'number',
+      deprecationWarning: "Increment expects an object as second parameter. Please pass the incrementor as option! ~> instance.increment(" + JSON.stringify(fields) + ", { by: " + countOrOptions + " })"
+    })
+
+    var identifier = this.__options.hasPrimaryKeys ? this.primaryKeyValues : { id: this.id }
+      , values     = {}
+
+    if (countOrOptions === undefined) {
+      countOrOptions = { by: 1, transaction: null }
+    } else if (typeof countOrOptions === 'number') {
+      countOrOptions = { by: countOrOptions, transaction: null }
+    }
 
-    if (count === undefined) {
-      count = 1;
+    if (countOrOptions.by === undefined) {
+      countOrOptions.by = 1
     }
 
     if (Utils._.isString(fields)) {
-      values[fields] = count;
+      values[fields] = countOrOptions.by
     } else if (Utils._.isArray(fields)) {
       Utils._.each(fields, function (field) {
-        values[field] = count
+        values[field] = countOrOptions.by
       })
     } else { // Assume fields is key-value pairs
-      values = fields;
+      values = fields
     }
 
-    return this.QueryInterface.increment(this, this.QueryInterface.QueryGenerator.addSchema(this.__factory.tableName, this.__factory.options.schema), values, identifier)
+    return this.QueryInterface.increment(this, this.QueryInterface.QueryGenerator.addSchema(this.__factory.tableName, this.__factory.options.schema), values, identifier, countOrOptions)
+  }
+
+  DAO.prototype.decrement = function (fields, countOrOptions) {
+    Utils.validateParameter(countOrOptions, Object, {
+      optional:           true,
+      deprecated:         'number',
+      deprecationWarning: "Decrement expects an object as second parameter. Please pass the decrementor as option! ~> instance.decrement(" + JSON.stringify(fields) + ", { by: " + countOrOptions + " })"
+    })
+
+    if (countOrOptions === undefined) {
+      countOrOptions = { by: 1, transaction: null }
+    } else if (typeof countOrOptions === 'number') {
+      countOrOptions = { by: countOrOptions, transaction: null }
+    }
+
+    if (countOrOptions.by === undefined) {
+      countOrOptions.by = 1
     }
 
-  DAO.prototype.decrement = function (fields, count) {
     if (!Utils._.isString(fields) && !Utils._.isArray(fields)) { // Assume fields is key-value pairs
       Utils._.each(fields, function (value, field) {
-        fields[field] = -value;
-      });
+        fields[field] = -value
+      })
     }
 
-    return this.increment(fields, 0 - count);
+    countOrOptions.by = 0 - countOrOptions.by
+
+    return this.increment(fields, countOrOptions)
   }
 
   DAO.prototype.equals = function(other) {