dimensions

The documentation says this "Even though mp-units library does not implement any Linear Algebra types it is generic enough to be used with other Linear Algebra libraries existing on the market.". A set of examples using Eigen would be helpful. Blaze would probably be good too, but personally I don't use it so it's a lower priority for me.

It came up in #41 that it would be nice to have functions like abs(), sqrt(), etc. implemented on $System<f64, U> (and friends) directly, and not just through traits, so that they could be called without the traits in scope.

I notice that every time I click home and choose a different type of device, it reverts back to opening https://virejdasani.github.io/Responsivize/ in each device instead of the URL I changed it to.

I think it should either save the URL you change it to to be used everywhere or add somewhere that we can change what the default URL is set to.