Perf++ shields

I put up a test sale for the boards https://www.tindie.com/products/Fyberlabs/arduino-perf-shields/ 15% off this weekend. Now $17 for 5. I can't sell them much cheaper without a higher volume.

The initial run seems OK, though I think the through-hole could shrink and still be compatible with many components. I'll be shifting it around for Rev B, but the initial boards work OK. The silkscreen is off on some of the boards, but most seem to be aligned and legible. I'll remove the perf holes next to the connectors to provide more soldering space for riser connectors.

The initial run has been shipped from pcbway. Hopefully they look good and are functional. I have put up prices and initial stock on Tindie. If we need another run, we should still be able to ship within the Tindie 14 day window.