[#1] Fixed up unused imports, docs, and tests.

src/one.rs

@@ -7,7 +7,7 @@ pub trait One: Sized + Mul<Self, Output=Self>
    ///
    /// # Laws
    ///
-   /// ```{.text}
+   /// ```text
    /// a * 1 = a       ∀ a ∈ Self
    /// 1 * a = a       ∀ a ∈ Self
    /// ```