fix(associations): 1:1 (belongsTo & hasOne) associations should use limit: null …

…by default since they are querying on primary key, closes #2698

lib/associations/belongs-to.js

@@ -108,6 +108,8 @@ module.exports = (function() {
 
       params.where = new Utils.and(params.where);
 
+      if (params.limit === undefined) params.limit = null;
+
       return association.target.find(params);
     };
 

lib/associations/has-one.js

@@ -102,6 +102,8 @@ module.exports = (function() {
 
       params.where = new Utils.and(params.where);
 
+      if (params.limit === undefined) params.limit = null;
+
       return association.target.find(params);
     };