Release 0.1.12

- tidy up Mat43 type

Release 0.1.11

- add fov / focal length conversions

Release 0.1.10

- fix quat mul_assign, add Quat::identity, fix up doc comments + add …

Release 0.1.9

- update docs

Release 0.1.8

- use prelude in tests

Release 0.1.7

- make generic trig and log functions, sweep through lib.rs comments …

Release 0.1.6

- fix unused temp warning

Release 0.1.5

- add ray_vs_cylinder + tests, point_sphere_distance + tests

Release 0.1.4

- comment out broken test

Release 0.1.3

- add sphere vs capsule and ray vs capsule functions