vec4.random(): improve performance and allow components to be negative

http://jsfiddle.net/Mm2Te/

http://jsperf.com/improve-on-vec4-random/2
Hermite and Bezier interpolations
fromRotationTranslationScale
sqlerp
Removed useless comment, ops
Optimized vec3 interpolations
Added mat4 creation variant, fixed vec3 interpolations

mat4.fromRotationTranslationScaleOrigin - creates a matrix with the
specified translation, rotation and scale around a given origin.
Removed useless multiplications
Custom build
Commented manifesty
Exposing vec2 object on the window
re-minified
Merge remote-tracking branch 'upstream/master'
fixed output vector missing 4th component
Merge branch 'master' of https://github.com/flowtsohg/gl-matrix into findoff
Merge branch 'master' of https://github.com/subatomicsystems/gl-matrix into findoff
Merge branch 'master' of https://github.com/acerix/gl-matrix into findoff