Support compilation on 64bit systems

Detect x86_64 with uname -m and adapt library-paths accordingly
Changed Bayer-pattern layout for current camera firmware

The readout of the sensor has changed with a firmware change (probably
in May 2013). Therefore, the Bayer-pattern needs to be adjusted).
Added section 'Changes'

The new section 'Changes' describes changes to older versions.
Added note about change in Makefile