Add random program generation and mutation.

offchain/src/gp/mod.rs

@@ -1,13 +1,3 @@
 pub mod population;
 pub mod genetic_ops;
-// pub mod fitness;
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_dummy() {
-        assert_eq!(2+2, 4);
-    }
-}
+pub mod generate;