Merge pull request recp#88 from yushli/master

Update quat.h

drop glm__memcpy, glm__memset and glm__memzero

* implement mat3_zero and mat4_zero functions
* copy matrix items manually in ucopy functions

Merge pull request recp#72 from recp/simd-update

SIMD update (NEON, SSE3, SSE4) + Features

Update README.md

Update README.md

Merge pull request recp#63 from recp/avx

avx: replace binary constants (resolve recp#62) with hex and fix glm_mul_avx

Merge pull request recp#59 from jonathanplatzer/avx

Fix alignment issue when using AVX

Merge pull request recp#56 from recp/sphere

aabb and sphere intersect functions

update docs

Merge pull request recp#42 from recp/optimizations

simd: optional shuffle configuration to save move instructions