Bunch of work on types

- Comment out a bunch of types modules for now
- Implement fmt::Display on Object (this breaks the build because Number doesn't
  implement Display yet)
- Move all the Is* traits to predicates.rs

Haven't run tests yet because they won't build...

types/src/lib.rs

@@ -1,12 +1,12 @@
-pub mod number;
+//pub mod number;
 mod bool;
-mod char;
-mod value;
+//mod char;
+mod number;
+mod object;
+mod predicates;
 
-pub use bool::Bool;
-pub use char::Char;
-pub use number::Number;
-pub use value::Value;
+pub use object::Object;
+pub use predicates::*;
 
 #[cfg(test)]
 mod tests {