Flashing Improvements

[nicinabox]

I've noticed folks having trouble with the flashing instructions as well as a fair amount of misinformation. I'd like to expand the Flashing section to include:

• Parts from QMK's LS readme on Flashing
• What is EE_HANDS for?
• When is eeprom flashing needed?
• Do both sides have to be connected to flash? (no)
• Do I have to flash both sides? (yes)
• Flashing on ARM-based machines like RPi
• ...other things?

[nicinabox]

avrdude on raspi

echo "deb http://apt.adafruit.com/raspbian/ jessie main" | sudo tee --append /etc/apt/sources.list
wget -O - -q https://apt.adafruit.com/apt.adafruit.com.gpg.key | sudo apt-key add -
sudo apt-get update
sudo apt-get install avrdude dfu-programmer gcc-avr avr-libc

[nicinabox]

Addressed in #9