pin down a few more versions
pin down a few more versions

ariesxje/ng2-rxjs-tryout,ahmadassaf/Angular-RxJS-Chat,RasmusTG/angular2-rxjs-chat,unclebumpy/angular2-rxjs-chat,ariesxje/ng2-rxjs-tryout,eduardoroyer/angular2-rxjs-chat,ahmadassaf/Angular-RxJS-Chat,eduardoroyer/angular2-rxjs-chat,RasmusTG/angular2-rxjs-chat,eduardoroyer/angular2-rxjs-chat,ng-book/angular2-rxjs-chat,ng-book/angular2-rxjs-chat,ariesxje/ng2-rxjs-tryout,unclebumpy/angular2-rxjs-chat,narnau/angular2-rxjs-chat,ng-book/angular2-rxjs-chat,princesust/angular2-rxjs-chat,narnau/angular2-rxjs-chat,ahmadassaf/Angular-RxJS-Chat,princesust/angular2-rxjs-chat,ng-book/angular2-rxjs-chat,unclebumpy/angular2-rxjs-chat,princesust/angular2-rxjs-chat,RasmusTG/angular2-rxjs-chat,narnau/angular2-rxjs-chat