Shopify/measured: Encapsulate measurements and their units in Ruby and Ruby on Rails.

Encapsulates measurements with their units. Provides easy conversion between units. Built in support for weight, length, and volume.Lightweight and easily extensible to include other units and conversions. Conversions done with Rational for precision.Since version 3.0.0, the adapter to integrate measured with Ruby on Rails is also a part of this gem. If you had been using measured-rails for that functionality, you should now remove measured-rails from your gem file.