message: fix hidden login modal-dialog problem
diff: "@angular/platform-browser": "2.4.7",
  "@angular/platform-browser-dynamic": "2.4.7",
  "@angular/router": "3.4.7",
  - "@ng-bootstrap/ng-bootstrap": "1.0.0-alpha.20",
  + "@ng-bootstrap/ng-bootstrap": "1.0.0-alpha.15",
  "angular2-infinite-scroll": "0.3.0",
  - "bootstrap": "4.0.0-alpha.6",
  + "bootstrap": "4.0.0-alpha.5",
  "bootswatch": "3.3.7",
  "font-awesome": "4.7.0",
  "angular2-cookie": "1.2.6",
  