Update to tip of HoTT
Add Groupoid to Makefile
Add NatCategory

After    | File Name                             | Before
-----------------------------------------------------------
1m46.12s | Category/Equality                     | 1m43.91s
0m22.80s | Functor/Equality                      | 0m21.73s
0m15.06s | NaturalTransformation/Equality        | 0m14.60s
0m07.22s | Category/Morphisms                    | 0m07.46s
0m04.89s | Groupoid                              | 0m05.27s
0m02.28s | Functor/CompositionLaws               | 0m02.15s
0m02.21s | NaturalTransformation/Composition     | 0m02.15s
0m01.90s | SumPreCategory                        | 0m01.83s
0m01.82s | ProductPreCategory                    | 0m01.79s
0m01.36s | NaturalTransformation/CompositionLaws | 0m01.40s
0m01.24s | NatCategory                           |   N/A
0m00.86s | BoolCategory                          | 0m00.86s
0m00.50s | SetCategory                           | 0m00.42s
0m00.27s | Common                                | 0m00.22s
0m00.26s | NaturalTransformation/Identity        | 0m00.26s
0m00.25s | Functor/Composition                   | 0m00.23s
0m00.24s | FunctorPreCategory                    | 0m00.25s
0m00.15s | Category/Core                         | 0m00.18s
0m00.14s | NaturalTransformation/Core            | 0m00.13s
0m00.12s | Functor/Core                          | 0m00.10s
0m00.12s | Category/Category                     | 0m00.09s
0m00.12s | Peano                                 | 0m00.12s
0m00.11s | Category/StrictCategory               | 0m00.09s
0m00.10s | NaturalTransformation                 | 0m00.10s
0m00.10s | Functor/Identity                      | 0m00.10s
0m00.10s | Utf8                                  | 0m00.08s
0m00.09s | Functor                               | 0m00.09s
0m00.07s | DiscreteCategory                      | 0m00.08s
0m00.04s | NotationsUtf8                         | 0m00.05s
0m00.04s | Notations                             | 0m00.03s
-----------------------------------------------------------
2m50.57s | Total                                 | 2m45.76s