Ch 7 completed.

I didn't agree with posting server-end code in a client accessible
file…not sure of the motivation behind that.
But, hadn't used spin before, that's kinda nifty.
Ch8 complete.

Learned that I need to learn _.
Otherwise, all else was already well understood.
Ch 9 complete

Best chapter yet! Super informative, great pattern for dealing with
errors. I didn't even know you could have a client-only Collection!