Add TypeMath for basic types

[ForNeVeR]

I was surprized by lack of default DoubleMath implementation. Maybe it should be added and registered by default, and maybe we need some another generic way to define instances for all the standard number types without duplicating the code too much.

[codeandcats]

Just merged in PR-11 which added support for Double Math.

@ForNeVeR If you have any ideas on how to more easily support other types that improves on the existing method I'd been interested for sure.

For now though I'm going to close this issue.

[ForNeVeR]

@codeandcats I'll think about it; thanks! The DoubleMath implementation looks good.