Adding PCB specifications, provided by johnnyr
https://github.com/ultimachine/RAMBo/issues/5#issuecomment-15076545
remove stop from JP3, update to eagle6.4
change SMA package size
ArduinoAddons for EXT-2 header
add freewheeling diodes, working on 32u2 layout,

start adding icoupler
finish icoupler addition, remove ps-select jumper
rotate motor and serial ext for easier wave solder
final connector move, change mount hole for wave

fix drc and silk errors, misc fixes
fix gnd fence
change thieve style, rst-en trace added back,

DTR resistor now pull up - now back to original usb reset behaviour of
Rambo
remove solder pads under mount holes
remove stale file
rework psu layout, improve decoupling
Merge pull request #6 from kakaroto/master

Added PCB specs
Add overvoltage protection to thermistor

based on nophead, bobc, NoobMan, Cefiar, and STB's discussion at
http://forums.reprap.org/read.php?13,197920,203564#msg-203564
rework driver passives to make room for barcode

removed resistor on reset/sleep
Change bulk caps to PTH
cleanup routing under 2560
add 10uH to AVCC, better location/val decoupling

for 2560, misc rerouting
add UL and rohs silk instructions to document