FileUpload multiple file drag when multiple set to false

[bnymncoskuner]

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Plunkr Case (Bug Reports)

http://plnkr.co/edit/ka0EAyfLDz1pgB7luFXe?p=preview

Current behavior
When multiple prop of FileUpload component is set to false, it works properly and does not allow to choose more than 1 file when upload button is used. However you can still drag multiple files into component and it lists them all.

Expected behavior
When multiple prop is set to false, dragging multiple files should not be allowed or first file should be added and rest should be ignored.

Minimal reproduction of the problem with instructions

You can view this bug on follower plnkr
http://plnkr.co/edit/ka0EAyfLDz1pgB7luFXe?p=preview

What is the motivation / use case for changing the behavior?

Please tell us about your environment:

• Angular version: 2.0.X

• PrimeNG version: 2.0.X

• 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 ]

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

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