Merge pull request #22 from Knueppl/master

Removed unneeded files in obcore.
restricted bounds of axis aligned raycaster
Merge branch 'master' of https://github.com/autonohm/obviously
fix for axis aligned raycaster (correct detection of zero crossings at partition borders)
Merge pull request #23 from Knueppl/master

Added Time class and modified the Timer class for more easily usage.
Merge branch 'master' of https://github.com/Knueppl/obviously

Conflicts:
	obvision/reconstruct/space/RayCastAxisAligned3D.cpp
cleaned grid approach
runtime optimization for grid approach
added switch for single/double precision in TSD approach
minor fixes
fix for camboard nano app