Allow multiple file and directory upload

<a href="https://github.com/tekmans"><img src="https://avatars1.githubusercontent.com/u/1766087?v=3" align="left" width="96" height="96" hspace="10"></img></a> **Issue by [tekmans](https://github.com/tekmans)**
_Monday Jan 16, 2017 at 09:59 GMT_
_Originally opened as https://github.com/pulse-project/pulse/issues/81_

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Creating a package needs multiple file and directory upload feature
