* added ambient occlusion tutorial example
Merge branch 'master' of https://github.com/libigl/libigl
- added tutorial example for picking using embree
- cleanup in the tutorial ordering
- started global cmakelist to compile all examples
- cleanup in the cmake building system for the tutorials
- fixed all compilation errors in the tutorials
- added global cmake file to compile all tutorials
linux compilation fixes
added some notes for the compilation on linux
version
conjugate example, fixed some #HEADER_ONLY errors
still missing : comments for all files
Merge branch 'master' of https://github.com/libigl/libigl

Conflicts:
	tutorial/cmake/FindLIBCOMISO.cmake
updated conjugate example to show quad meshes and planarized conjugate mesh