This commit moves the library into a usable state.

There is still some work to do with defining
integers and whole numbers better, but for now
the library is usable and reasonably tested.

src/integer.rs

@@ -4,7 +4,24 @@ use super::number::Number;
 /// A trait that defines what is required to be considered
 /// an Integer. [List of types of numbers][1]
 ///
+/// This is meant to have all the similarities between
+/// [u8][2], [u16][3], [u32][4], [u64][5], [usize][6],
+/// [i8][7], [i16][8], [i32][9], [i64][10], [isize][11].
+/// Most of the comments and documentation were taken
+/// from the [rust-lang std docs][12].
+///
 /// [1]: https://en.wikipedia.org/wiki/List_of_types_of_numbers
+/// [2]: https://doc.rust-lang.org/std/primitive.u8.html
+/// [3]: https://doc.rust-lang.org/std/primitive.u16.html
+/// [4]: https://doc.rust-lang.org/std/primitive.u32.html
+/// [5]: https://doc.rust-lang.org/std/primitive.u64.html
+/// [6]: https://doc.rust-lang.org/std/primitive.usize.html
+/// [7]: https://doc.rust-lang.org/std/primitive.i8.html
+/// [8]: https://doc.rust-lang.org/std/primitive.i16.html
+/// [9]: https://doc.rust-lang.org/std/primitive.i32.html
+/// [10]: https://doc.rust-lang.org/std/primitive.i64.html
+/// [11]: https://doc.rust-lang.org/std/primitive.isize.html
+/// [12]: https://doc.rust-lang.org/std/index.html
 pub trait Integer : Number
 {
 }