fix(index-async): fix inlining of angular-loader into index-async.html

Previously, `angular-loader` was never inlined into `index-async.html`, because running `sed` with a
multiline RegExp fails to match anything, since `sed` matches per line. Using the `fs` module
directly, solves the issues.
(Now, we no longer depend on `shelljs`.)

Closes angular#309

Author: gkalpak

package.json

@@ -14,8 +14,7 @@
     "karma-firefox-launcher": "^0.1.7",
     "karma-jasmine": "^0.3.8",
     "karma-junit-reporter": "^0.4.1",
-    "protractor": "^3.2.2",
-    "shelljs": "^0.6.0"
+    "protractor": "^3.2.2"
   },
   "scripts": {
     "postinstall": "bower install",
@@ -33,6 +32,6 @@
     "preprotractor": "npm run update-webdriver",
     "protractor": "protractor e2e-tests/protractor.conf.js",
 
-    "update-index-async": "node -e \"require('shelljs/global'); sed('-i', /\\/\\/@@NG_LOADER_START@@[\\s\\S]*\\/\\/@@NG_LOADER_END@@/, '//@@NG_LOADER_START@@\\n' + sed(/sourceMappingURL=angular-loader.min.js.map/,'sourceMappingURL=bower_components/angular-loader/angular-loader.min.js.map','app/bower_components/angular-loader/angular-loader.min.js') + '\\n//@@NG_LOADER_END@@', 'app/index-async.html');\""
+    "update-index-async": "node -e \"var fs=require('fs'),indexFile='app/index-async.html',loaderFile='app/bower_components/angular-loader/angular-loader.min.js',loaderText=fs.readFileSync(loaderFile,'utf-8').replace(/sourceMappingURL=angular-loader.min.js.map/,'sourceMappingURL=bower_components/angular-loader/angular-loader.min.js.map'),indexText=fs.readFileSync(indexFile,'utf-8').replace(/\\/\\/@@NG_LOADER_START@@[\\s\\S]*\\/\\/@@NG_LOADER_END@@/,'//@@NG_LOADER_START@@\\n'+loaderText+'    //@@NG_LOADER_END@@');fs.writeFileSync(indexFile,indexText);\""
   }
 }