add .gitigore, update documentation and create test sketch
Merge pull request #1 from ahfergus1/master

Request to Pull in Circuit PDF
fix accelerometer data sheet link in readme
add l3g4200d sensor code
read the accelerometer
document gyro code, fix mem leak
document adxl345.ino
add magnetometer sketch
add barometer sketch.
update branch to master
Merge branch 'sensorDev'

Conflicts:
	arduinoSketches/bmp085/bmp085.ino
merge with sensorDev
Bring all sensors into one sketch - IMU_Controller
remove test processing sketch
Put everything into the IMUController