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.
Fixed variable naming error preventing tetgen being compiled.
Following the forked version of tetgen with added cmake functionality.
Using the cmake install prefix as the install locatoin for the external dependancies, if we build them.
Removed the #defines for including/excluding assimp. We always need it and tetgen now.
Following tetgen with the correct install targets.
Updated the readme following the new updates/improvements.
Fixed typos, added a link to the geant4 website.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	CMakeLists.txt
	src/CADMesh.cc