Moved .gitignore
Migrated code from bogie to tripod

USART (but keeping the code in place for additional ports)
SerialProtocol (Only removed BogieCommon dependency)
RingBuffer (Only removed BogieCommon dependency)
avr_compiler (no changes)
makefile (only changed MCU type and source files)
tripod.c (only contains an empty main)
Ignored .link files

No, these aren't ipod files.
This is just an extension I'm using to signify a link to a pdf,
to make it faster for me to switch between code and documentation.
Started code for servos

I have a rough description of how it will work, and one function
written.
I also added comments on where to find the hardware documentation for
the various things that need to be implemented.  (Camera, accelerometer,
barometric pressure sensor, and servos)
Fixed Sabertooth watchdog

Watchdog wasn't enabling, since the bogie controller was booting up faster than
the sabertooths, and sending the watchdog message before the bogies were ready
to accept them.  The fix was adding a 100ms delay.  It's not the best fix, but
there's nothing in the datasheet about this, and there's no indication from the
sabertooth that we can look for to tell that it's working (other than the status
LEDs).
Copied over useful files from bogie
Added arm files

Doesn't fully work yet - stuff like the timing and fixed point haven't
been set up yet.  However, the framework is there.
Added RTC config

Copied over from the PID branch of the bogie code
Added itoa

I found this implementation online, but I modified it to return the size
of the string, for easier integration into our USART_Write functions.
Added code for digital potentiometers

They're actually called digital magnetic encoders, but since I get an
absolute position out of them (like a continuous-turn potentiometer),
I'm calling them digital potentiometers.
Anyway, the code uses SPI, and it seems to work. What we have to watch
out for, however, is the shaft slipping.  It has plenty of ability to
do so, and there's no limit switches for me to index off of.  However,
as long as the shaft doesn't slip, the limits appear very repeatable,
and the mechanism shouldn't break itself apart.

= Marshal
PID works

PID on the elbow is tuned, and the feedback is scaled.  It shouldn't be
difficult on the shoulder either.