Make the belongsTo relation remotable

lib/relations.js

@@ -277,6 +277,15 @@ Relation.belongsTo = function (anotherClass, params) {
     }
   };
 
+  // Set the remoting metadata so that it can be accessed as /api/<model>/<id>/<belongsToRelationName>
+  // For example, /api/orders/1/customer
+  var fn = this.prototype[methodName];
+  fn.shared = true;
+  fn.http = {verb: 'get', path: '/' + methodName};
+  fn.accepts = {arg: 'refresh', type: 'boolean', http: {source: 'query'}};
+  fn.description = 'Fetches belongsTo relation ' + methodName;
+  fn.returns = {arg: methodName, type: 'object', root: true};
+
 };
 
 /**