Merge pull request #16 from lanice/fmod_integration

Fmod integration
add zoom function when scrolling the mousewheel while left shift is pressed
pressing SPACE causes zoom-factor to smoothly go to default position (like the rotation)
Merge pull request #20 from lanice/enable_zooming

Enable zooming
Merge branch 'master' into fmod_integration
Merge remote-tracking branch 'origin/master' into fmod_integration
set comments to coding standard