Provide PKG installer for MacOS

[dex4er]

PKG installer would be much better option than bare DMG file.

We should add it to the packages for 0.1.1 release.

[dex4er]

Works as expected hoverer PKG must be signed the same way as DMG.

[robertobandini]

Works as expected hoverer PKG must be signed the same way as DMG.

Ok, I remember there is a specific certificate, I'll check asap, thank you.

[robertobandini]

@dex4er I set this issue in progress, feel free to close it when it's done, thanks.

[dex4er]

Nightly has working PKG already