Reorganize module structure

src/lib.rs

@@ -1,10 +1,9 @@
-#![allow(dead_code)] //TODO eventually turn this off
 mod bnf;
-mod choice;
-mod combinators;
+pub mod choice;
+pub mod combinators;
 mod parser;
-mod primitives;
-mod sequence;
+pub mod primitives;
+pub mod sequence;
 
 pub use parser::{ParseResult, Parser, ParserInput};