cagra 0.1.0

cagra [![Crate](http://meritbadge.herokuapp.com/cagra)](https://crates.io/crates/cagra) [![docs.rs](https://docs.rs/cagra/badge.svg)](https://docs.rs/cagra) [![Build Status](https://travis-ci.org/termoshtt/cagra.svg?branch=master)](https://travis-ci.org/termoshtt/cagra)
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Calculation Graph library