Replace viewNova gate with our own, making sure we are last

[pdbreen]

I don't like this solution, its too dependent on how other things are actually implemented, but it works. It relies on the following:

• gate definitions are unique. If a gate is defined a second time, the second definition replaces the first
• nova defers all of its registration until the ServingNova event is dispatched.
• If we are the last listener for that event, we can replace the gate definition
• to be last, we defer registering for the ServingNova event until the NovaServiceProviderRegistered event is raised

I'll leave it up to you whether or not to use it.

[drewroberts]

I am planning to pull this out later and put it into a CLI Installer of the Tipoff packages per my discussion with @jasonmccreary so that it can be added to the actual Laravel application in the NovaServiceProvider

[pdbreen]

That's preferred. There's still a risk Nova changes something that breaks the installer, but that's much better than Nova or Laravel changing something that breaks an already installed application. Also provides some flexibility to do, or help with, other installation type things that are likely to be required.