improvement, for ACE camera model the exposuretime range is a real one.
- changed setExposureTime() to take care of camera model, ACE model can be
set simply using the SetExposureTimeAbs().
- changes Makefile for compilation wit Pylon 2.3.3
- removed from BaslerCamera.sip file getImageSize() binding.
- change .gitignore for *.bak file (nedit backup file)