MYFACES-4572 - Return 'Production' as default project stage

[volosied]

https://issues.apache.org/jira/browse/MYFACES-4572

Previous JS code:

   getProjectStage:function () {
   ....
                    }
                    else {
                        //we found the script, but there was no stage parameter -- Production
                        //(we also add an override here for testing purposes, the default, however is Production)
                        projectStage = getConfig(PRJ_STAGE, STG_PROD);
                    }
                }
            }
            /* we could not find anything valid --> return the default value */
            this._projectStage = getConfig(PRJ_STAGE, projectStage || STG_PROD);
            }