expose transform pipeline and require node api inside of the browser one to avoid race conditions

src/babel/api/browser.js

@@ -1,3 +1,4 @@
+require("./node");
 var transform = module.exports = require("../transformation");
 
 transform.options = require("../transformation/file/options");

src/babel/api/node.js

@@ -5,6 +5,7 @@ import * as util from "../util";
 import fs from "fs";
 
 export { util, acorn, transform };
+export { pipeline } from "../transformation";
 export { canCompile } from "../util";
 
 export { default as options } from "../transformation/file/options";