Merged all IMU-related sketches and scripts
Added angles (roll, pitch, yaw) calculation to IMU library
Handle IMU loop time as a float rather than a uint32_t
Use time in PID calculations
Added function to reset PID calculations
Read serial device and speed from command line arguments
Removed axes from acceleration display script
Output accelerometer values for further processing
Added sketch to test ESCs/motors independently
Added quadcopter sketch (work in progress)