Remove _metadata and _module routes

See #185

modules/actions/serveFile.js

@@ -7,7 +7,6 @@ import serveStaticFile from './serveStaticFile';
  * Send the file, JSON metadata, or HTML directory listing.
  */
 export default function serveFile(req, res) {
-  // Deprecated.
   if (req.query.meta != null) {
     return serveMetadata(req, res);
   }
@@ -16,7 +15,6 @@ export default function serveFile(req, res) {
     return serveAutoIndexPage(req, res);
   }
 
-  // Deprecated.
   if (req.query.module != null) {
     return serveModule(req, res);
   }

modules/middleware/validateQuery.js

@@ -2,8 +2,8 @@ import createSearch from '../utils/createSearch';
 
 const knownQueryParams = {
   main: true, // Deprecated, see #63
-  meta: true, // Deprecated
-  module: true // Deprecated
+  meta: true,
+  module: true
 };
 
 function isKnownQueryParam(param) {

modules/server.js

@@ -3,8 +3,6 @@ import express from 'express';
 // import serveAuth from './actions/serveAuth';
 import serveFile from './actions/serveFile';
 import serveMainPage from './actions/serveMainPage';
-import serveMetadata from './actions/serveMetadata';
-import serveModule from './actions/serveModule';
 import servePublicKey from './actions/servePublicKey';
 import serveStats from './actions/serveStats';
 
@@ -51,36 +49,6 @@ app.use(
   })
 );
 
-app.use(
-  '/_metadata',
-  createRouter(app => {
-    app.get(
-      '*',
-      validatePackageURL,
-      validatePackageName,
-      validateQuery,
-      fetchPackage,
-      findFile,
-      serveMetadata
-    );
-  })
-);
-
-app.use(
-  '/_module',
-  createRouter(app => {
-    app.get(
-      '*',
-      validatePackageURL,
-      validatePackageName,
-      validateQuery,
-      fetchPackage,
-      findFile,
-      serveModule
-    );
-  })
-);
-
 app.get(
   '*',
   validatePackageURL,