Customer search.

Oh boy. I don't like this query sitatuion. First of all, I'm making
seven queries. At least it's easy. Second, this like vs ilike shennanigans.
I still think it's better than needing to require postgres in developement.
This is the ONLY thing that's specific per database.
Search results link to their results.

That's kinda important.

Fixes #17.
Properly scope customers

We only want to find our own shop's customers.
Merge pull request #31 from artisan-tattoo/search_customers

Search customers