squeezed USB DIP module 100 mils narrower

SMT stencils from previous version should still work, though the
USB connector shield is very slightly narrower to clear the header
through-holes (IIRC, i only had to trim about 1 mil off so it
should be fine)
fixed a mistake on XMEGA A4U board

one of the crystal's ground pads was not connected on the schematic
(the lines were "touching" but not actually connected)
more .gitignore
a small breakout for the SOT25 footprint

i did this one a while back (I've already got the order back
from OSH Park) but apparently didn't commit it.
a new version of the xmega e5 board
Merge branch 'master' of github.com:mokus0/schematics