Start/End dates don't display when clicking on a existing Schedule event

[wonbyte]

I'm submitting a ... (check one with "x")

[x ] bug report => Search github for a similar issue or PR before submitting
[ ] feature request => Please check if request is not on the roadmap already https://github.com/primefaces/primeng/wiki/Roadmap
[ ] support request => Please do not submit support request here, instead see http://forum.primefaces.org/viewforum.php?f=35

Current behavior
When clicking an existing event on the Schedule, the date of the event is not populated in the dialog box. If you add a start date to the event, then ALL events display the just added date.

Expected behavior
If you click an event on the calendar, the date of the event should appear in the pop up dialog box for that specific event. If you add a date, the date should only be added for the event that you clicked.

Minimal reproduction of the problem with instructions
Go to the Schedule demo page and click an event. No start date will populate. If you add a start date and click on another event, it will display the start date you just added.
http://www.primefaces.org/primeng/#/schedule

What is the motivation / use case for changing the behavior?
Event dates should be specific to the event

Please tell us about your environment:
Windows 7, Mac, vscode, yarn

• Angular version: 2.0.X
  Angular: 2.4.3

• PrimeNG version: 2.0.X
  PrimeNG : 1.1.4 and 2.0-rc1

• Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]
  Chrome

• Language: [all | TypeScript X.X | ES6/7 | ES5]
  Typescript

• Node (for AoT issues): node --version =
  Node: 7.4.0

[wonbyte]

@cagataycivici is this related to #1915