Fix debug compilation bugs

Bug fixes:

• Print not declared variables
• Use printf as Arduino Serial.print

Refactors:

• Improve DEBUG macro validation

v1.3.0

• Added sensitivity variation as a new Constructor
• Added get method to retrieve resolution
• Renamed dmpLinearAccelInWorld() method as dmpConvertToWorldFrame() since it needs to be used with gyro data as well
• Added example to show how to extract data required by ROS IMU message
• One doubt is whether 1G acceleration is 8192 or 16384 (At 2G resolution) because MPU datasheet says full range is 32768. For now using 8192 as it is hardcoded as gravity. Similarly using 16384 as max Gyro resolution. Please rectify this if wrong.
• Gravity value needs to be updated to use the new resolution variable to be completely compatible with resolution variation

v1.2.0

• Update library from i2cdev
• add Support multiple Wire objects in MPU6050 device code

v1.0.2

Set fifo rate and MPU address

v1.0.1

Remove debug messages

v1.0.0

• Update examples
• Update README
• New Wiki!!

v0.6.0

• adding an IMU namespace
• Update the I2C structure

v0.5.0

• Adding support for SAM architecture
• Fixing devicedId value
  Thanks @sylvaneau

v0.4.0

• Improved the performance of normalizing quaternions and vectors, thanks @quesswho
• Enhanced device ID checking to allow usage of certain available clones, thanks @holzachr
• And more updates from jrowberg/i2cdevlib

v0.3.0

• Add support Arduino Nano BLE Sense
• Update examples