A crate to derive the TryFrom trait on enums using procedural macros.
Expect frequent breakage for now.
This adds the ability to #[derive(TryFromPrimitive)], which in combination
with one (well zero, but that's not useful) or more
#[FromPrimitiveType="type"] attributes lets you automatically derive
TryFrom<type> for enum types.
Detailed documentation can be generated with cargo doc.