e1f1d65d0c
Going through the commit history on GitHub, the `_angular` is for noConflict mode, the case where you have an old reference to a variable called Angular you want to preserve. Here is the commit that added _angular in : https://github.com/angular/angular.js/commit/12ba6cec4fThis feature was later removed here:9faabd1ba0The variable 'made it through', it's redundant now. Closes #7215
AngularJS 
AngularJS lets you write client-side web applications as if you had a smarter browser. It lets you use good old HTML (or HAML, Jade and friends!) as your template language and lets you extend HTML’s syntax to express your application’s components clearly and succinctly. It automatically synchronizes data from your UI (view) with your JavaScript objects (model) through 2-way data binding. To help you structure your application better and make it easy to test, AngularJS teaches the browser how to do dependency injection and inversion of control. Oh yeah and it also helps with server-side communication, taming async callbacks with promises and deferreds; and makes client-side navigation and deeplinking with hashbang urls or HTML5 pushState a piece of cake. The best of all: it makes development fun!
- Web site: http://angularjs.org
- Tutorial: http://docs.angularjs.org/tutorial
- API Docs: http://docs.angularjs.org/api
- Developer Guide: http://docs.angularjs.org/guide
- Contribution guidelines: http://docs.angularjs.org/misc/contribute
- Dashboard: http://dashboard.angularjs.org
Building AngularJS
Once you have your environment setup just run:
grunt package
Running Tests
To execute all unit tests, use:
grunt test:unit
To execute end-to-end (e2e) tests, use:
grunt package
grunt test:e2e
To learn more about the grunt tasks, run grunt --help and also read our
contribution guidelines.