Links two arduinos together using a buffer on the producer side. One 32bit word
one byte of metadata, and one byte of checksum is transmitted in each message 

Producer:
Setup:
  * Wire.begin(addr) should be done in calling program's setup() func 
  * Producer will be setup as a I2C slave with the address specified in
    Producer::Producer(int address);
  * Wire.onRequest(void(*)()) must be setup in calling program's setup() to
    call a local function which references Producer::i2cRequest()
    ***TODO: FIX THIS***
Run:
  * When the buffer is written one byte of metadata is attached to the data.
    Producer::writeBuffer(word data,byte meta);  

Consumer:
Setup:
  * Wire.begin() should be done in calling program's setup() func
  * Consumer will be setup as a I2C master and read from the slave with address
    specified in Consumer::Consumer(int address);
  * 
Run:
  * Consumer::readBuffer() returns the meta for the recieved data
    Special metas:
      * 0xFF - Buffer full
      * 0xFE - Checksum failed ( data lost )
  * Consumer::getValue(meta) returns the most recent data for that meta
  * Consumer::getUpdate() reads all avaiable data in buffer, only data for most
    recent meta is avaiable

Requirements:
  * Arduino 0019 or greater

Limitations:
  * Only I2C implemented
  * No data handshake, if checksum failes data is lost.
  * Does not tell the producer when buffer is full (dumps the buffer and 
    'resets' the buffer)
Install:
  To install copy the ProducerConsumer/ directory into your arduino 'libraries'
  directory
  ie:
    cp -a ProducerConsumer [/path/to/arduino]/libraries