admin-ui should be packaged as NPM package, possibly based in its own git repository

It would allow to reuse the code inside FH NGUI.

This suggestion covers following requirements of downstream projects (UPS and FH NGUI):

• ability to point to released NPM package
• ability to point to development version (NPM allows to point to #master or #branch as a git/github branch)
• ability to develop quickly: use current sources from external directory (with npm link)