Fix an issue with asc not finding bundled library files in the browser; Minor cleanup

tests/browser-asc.js

@@ -0,0 +1,39 @@
+const asc = require("../dist/asc.js");
+
+const stdout = asc.createMemoryStream();
+const stderr = asc.createMemoryStream();
+
+const files = {
+  "/module.ts": `import "allocator/arena";`
+};
+
+asc.main([
+  "./module.ts",
+  "--textFile"
+], {
+  stdout: stdout,
+  stderr: stderr,
+  readFile: (name) => {
+    console.log("readFile: " + name);
+    if (files.hasOwnProperty(name)) {
+      return files[name];
+    }
+    return null;
+  },
+  writeFile: (name, data) => {
+    console.log("writeFile: " + name);
+  },
+  listFiles: (dirname) => {
+    console.log("listFiles: " + dirname);
+    return [];
+  }
+}, err => {
+  if (err) {
+    console.log(">>> THROWN >>>");
+    console.log(err);
+  }
+  console.log(">>> STDOUT >>>");
+  process.stdout.write(stdout.toString());
+  console.log(">>> STDERR >>>");
+  process.stdout.write(stderr.toString());
+});