i2csensors

i2csensors is used at run time in 8 crates.

Depender			i2csensors version
		si7021		^0.1.3
		i2cdev-bmp280		0.1.*
		i2cdev-l3gd20		0.1.*
		i2cdev-lsm303d		0.1.*
		i2cdev-lsm9ds0		0.1.*
		i2cdev_bno055		^0.1.2
		i2cdev-lsm303dlhc		0.1.*
		i2cdev-bmp180		^0.1.0