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

Encapsulate measurements and their units in Ruby. Contribute to Shopify/measured development by creating an account on GitHub.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.The adapter to integrate measured with Ruby on Rails is in a separate measured-rails gem.