PXF v1.3.1: Issue #11 fix

Fix of the Issue #11:
- LSM9D: pin -> NC and Pin 15, 16,17- > pin 18 connection
- MPU9250 : Pin 1 -> 3v3
Merge pull request #13 from imuguruza/master

PXF v1.3.1: Issue #11 fix, v1.3.1 creation