fix I2C pinmux
quick shell command to test the I2C by reading the accelerometer
some notes about where to place the i2c variables currently in main global scope
Merge pull request #33 from rambo/i2c_pinmux_fix

I2c pinmux fix
Update Chibios 2.6.x stable
Update Makefile to match current 2.6.x demos
resolving conflicts