Merge pull request #1 from czechboy0/master

OS X 10.8 compatibility tweaks
Minor fixes to make compiler happy.
License changed to LGPL.
force copy of _prefix by using string instead of const char *
Merge pull request #3 from czechboy0/povray_path_fix

Povray _prefix type (const char* -> std::string)
readme update
Merge branch 'master' into hypergp-integration

Conflicts:
	src/sensor/camera.cpp