Adding instructions to ignore the "Disable Bootup Info" section in the hobbytronics websites

Jon recommended to ignore this section as it may interrupt serial communication on the Arduino.
Add instruction on how to get serial module

Adding "sudo apt-get install python-serial" so users know where to find the python serial library/module
Merge branch 'patch-2' of https://github.com/rafdizzle86/BrickPi
Updated Board Design and Schematic

- We have improved the logic level interface.  Many pointed out that
while our original design had 5V logic from the Arduino chip interfacing
with the 3.3V logic from the BrickPi.  Although we hadn’t seen any
problems, it could still be dangerous to run the system like this.  The
problem has been corrected.
- Firmware Programming Options.  We’ve added positions for an FTDI
programmer if that’s your thing.  We will also add a tutorial for how to
upgrade the firmware using another Arduino.
- Board Layout.  We noticed that if the BrickPi made contact with the
USB stack on the RPi, it could short out and reset the RPi.  We’ve
condensed the board size a bit so that the motor ports no longer overlap
with the USB stack.
- Improved Clock.  We’ve upgraded the Arduino clock source from a
resonator to a full blown crystal.  This will result in more reliable
serial communication and a more stable system.
- Power Improvements:  Due to popular demand, we added the footprint for
a switching regulator.  The hardware for the switching regulator greatly
extends battery life over the switching regulator originally planned,
but is out of our original budget.  So we designed the board to support
both.  Everyone will receive the footprint and will be able to upgrade
their board on their own.  We are offering backer levels where we will
upgrade your board power supply as well.
- Sensor Ports:
o Ultrasonic Sensor Support:  Previous versions were not going to
support the Ultrasonic Sensor because it uses some 9V power in some
instances.  By adding the extra Arduino chip, you should be able to use
the Ultrasonic Sensor on all 4 sensor ports.
o Extra Sensor Ports:  We have broken out a dedicated fast I2C port
directly to the BrickPi.  This will not be populated (we won’t actually
solder the port in place) in the basic product unless we cross the $100k
mark.  But everyone will have the option of upgrading to it themselves.
- Extra Motor Port.  By adding the extra Arduino chip in, we’re able to
add another motor port.  There will be positions on the board for 4
motor ports.  Standard BrickPi will still ship with three already
soldered.
- Power Protection.  The latest design featured an additional PTC fuse
that will protect your Raspberry Pi.