Added assimp v3.1.1 as a submodule.
Added tetgen v1.5.0 as a submodule. This is a fork/mirror hosted by Christopher Poole.
Using the tetgeniobehavior well calling tetgen.
Removed VCGLIB as a dependancy. Its development is too unstable, and it is hard to know where to freeze a version locally.
Added tetgen and assimp to the cmake build system as external projects, so we can compile them when we compile CADMesh.
Ignoring vim *.swp files.