Couple quick fixes to install script.

[greatbacon]

It seems that by default Macs don't have a profile.d created, so I added an idempotent line near the beginning to create the directory (which will require sudo permissions)

I also modified the logic around vault initialization because it was throwing a unary operation expected error in the previous logic if you had already initialized your vault.

[TheHackmeister]

I went ahead and merged this. Will circle back on better profile.d management later.