Update of the librairies code

Add of the baroaltimeter class (Bmp085)
Refactoring of the code :
the componnents' libs just init and read, and send it to IMU class
IMU class build a data array, and send it.

Add of new comments
Merge branch 'master' of https://github.com/GoncalvesDavid/projet2A-fusee-instrumentee