Added Radians and Degrees to the trig module.

These types allow the correct tracking of the type of angle measurement
being used.

src/lib.rs

@@ -6,6 +6,9 @@
 #![feature(associated_consts)]
 
 
+#[macro_use]
+mod macros;
+
 mod zero;
 mod one;
 mod bounded;
@@ -15,7 +18,7 @@ mod integer;
 mod real;
 mod constants;
 
-pub mod trig;
+mod trig;
 pub mod vector;
 pub mod matrix;
 pub mod quaternion;
@@ -28,3 +31,4 @@ pub use self::whole::Whole;
 pub use self::integer::Integer;
 pub use self::real::Real;
 pub use self::constants::Constants;
+pub use self::trig::{Degree, Radian};