look_at() implemented as a part of Transform trait
Merge pull request #31 from kvark/try-look-at

look_at() implemented as a part of Transform trait
Fix quat::Quat::from_angle_{x|y|z}

These functions were broken due to mistakenly using the full angle theta
in one place instead of theta / 2. This resulted in non-unit
quaternions that definitely did not rotate things correctly.
Fix comments on Quat::from_angle_{x|y|z} functions
Merge pull request #33 from zhanrnl/fix-quat-from_angle

Fix quat::Quat::from_angle_{x|y|z}
Re-document build instructions in README and shorten limitations section
derive IterBytes for vectors, points, and angles

It's useful to be able to have types like `Vec3<i32>` as hashtable keys.
Merge pull request #34 from bjz/readme

Re-document build instructions in README and shorten limitations section
Merge pull request #32 from rlane/iterbytes

derive IterBytes for all structs
-Impliment to_mat4 for Transform3D and quaternion
-Add a translate builder for Transform3D