added mat4 translate and scale
Improved the performance of mat4 multiply.
Documented the mat4 multiply optimization.
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
Merge branch 'master' of https://github.com/csherratt/cgmath-rs
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
Merge pull request #14 from bpbp-boop/master

Fixed Mat4::look_at
Changed 'self lifetime to 'a
Merge pull request #15 from JarrettBillingsley/master

Changed 'self lifetime to 'a
pkgid and make dead code public
Merge pull request #17 from cmr/master

pkgid and make dead code public
Merge remote-tracking branch 'bjz/master'
Added Default to all datatypes