removing old code

evaluate.js

@@ -1,18 +0,0 @@
-var parse = require("./parse.js").parse;
-
-function isAtom(x) {
-  return stx.exprType != "List";
-}
-
-function evaluate(exp, env) {
-  if (isAtom(exp)) {
-    switch (exp.exprType) {
-      case "Function":
-        return evaluate(invoke(exp, env), env);
-      case "Name":
-        return lookup(expr.val);
-      default:
-        return expr.val;
-    }
-  }
-}