Make ng/app structure for user management screen

Originally reported by: **Shashank Agrawal (Bitbucket: [sagrawal31](https://bitbucket.org/sagrawal31), GitHub: [sagrawal31](https://github.com/sagrawal31))**

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Add a ant script in _Install.groovy to copy user management files to main app

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- Bitbucket: https://bitbucket.org/causecode/nucleus/issue/14
