More constants related to pi
Much more precise fastCos and fastSin

fastCos and fastSin had a max error of ~0.2 on [-pi pi].
The updated version is ~0.000007.
rename three_half_pi() => three_over_two_pi()
branchless wrapAngle
Merge pull request #264 from Nojan/fast_trigonometry

More precision for fastCos and fastSin #264