Improve installer

[walles]

The drag-and-drop-to-install part is good and should still be there.

After that though, the user needs to be guided into right-clicking the now-installed binary and Open:ing it.

Single-shot user study behind this suggestion :).

[walles]

Or we should just create a .pkg installer that can guide the user into right-click-to-open the app after it has been moved into /Applications:

http://s.sudre.free.fr/Software/Packages/resources.html

Also available on Github:
https://github.com/packagesdev/packages

[walles]

This has been improved now, but still isn't great:

curl https://raw.githubusercontent.com/walles/bubblemon/master/osx/install.sh | bash

Having this in Homebrew would be better, that would basically do the same thing as the curl | bash solution but with neater packaging.