chore(benchpress): add browserify bundling

Use browserify to bundle benchpress and its dependencies.

modules/benchpress/index.ts

@@ -1,2 +1,6 @@
-require(require('traceur').RUNTIME_PATH);
+require('reflect-metadata');
+require('traceur/bin/traceur-runtime');
 module.exports = require('./benchpress.js');
+// when bundling benchpress to one file, this is used
+// for getting exports out of browserify's scope.
+global.__benchpressExports = module.exports;