* templates
* Extending igl::cat to work with a std::vector of matrices
* Small fix
* Fixing std::vector version of adjacency_list
* Change MatrixBase -> PlainObjectBase to fix compile error in boundary_loop
* Fixing function definition for adjacency_list
* Added test for cat
* Extending writeOBJ to work with mixed tri/quad meshes
* Code review feedback
* Writing lines instead of faces
* Adding template for test compile
* Fixing brace style and switching to trigraph
* Fixing braces
* another brace
* PlainObjectBase -> MatrixBase
* Sneaking in a few more template instantiations
* PlainObjectBase for outputs
* adding template to fix appveyor windows link error