ray-plane and ray-sphere intersection
cleaning up from upstream merge
Merge pull request #9 from JeffBelgum/intersections

ray-plane and ray-sphere intersection
Merge pull request #8 from kvark/master

Transform::concat implemented
Formatting cleanups
Add a benchmarking suite for matrix.
cleaned up formatting in matrix.rs in both test and bench
Add travis support for bench build.
Pad out the benchmarks to make the performance difference more pronounced.
This also speed the benchmarks up since the bench suite has trouble with
benchmarks that less then 100ns in length.
Merge pull request #10 from csherratt/bench

Add a benchmarking suite for matrix.
Improved the performance of mat4 multiply.
Documented the mat4 multiply optimization.
update to compile on latest rustc
Merge pull request #12 from csherratt/master

update to compile on latest rustc
Merge pull request #11 from csherratt/mat4_opt_only

Improved the performance of mat4 multiply.
Add Colin Sherratt to AUTHORS
Fix ortho asserts
Merge pull request #13 from bpbp-boop/master

Fix ortho asserts
Add Mat4::look_at

Hopefully I got this right...
Fixed Mat4::look_at