`ng github-pages:deploy` still requires `angular-cli-build.js`

[JohannesHoppe]

1. OS: Windows 8.1, but doesn't matter
2. Versions.

angular-cli: 1.0.0-beta.11-webpack.2
node: 6.3.1
os: win32 x64

1. Repro steps. Was this an app that wasn't created using the CLI? What change did you
   do on your code? etc.
   Fresh project created with ng new
2. The log given by the failure. Normally this include a stack trace and some
   more information.

 ng github-pages:deploy
(node:10264) fs: re-evaluating native module sources is not supported. If you are using the graceful-fs module, please update it to a more recent version.
- BuildingNo angular-cli-build.js found. Please see the transition guide: https://github.com/angular-cli/angular-cli/blob/master/TRANSITION.md#user-content-brocfile-transition.
Error: No angular-cli-build.js found. Please see the transition guide: https://github.com/angular-cli/angular-cli/blob/master/TRANSITION.md#user-content-brocfile-transition.
    at Class.module.exports.Task.extend.setupBroccoliBuilder (D:\theFolder\node_modules\angular-cli\lib\models\builder.js:57:13)
    at Class.module.exports.Task.extend.init (D:\theFolder\node_modules\angular-cli\lib\models\builder.js:89:10)
    at new Class (D:\theFolder\node_modules\core-object\core-object.js:18:12)
    at Class.module.exports.Task.extend.run (D:\theFolder\node_modules\angular-cli\lib\tasks\build.js:15:19)
    at build (D:\theFolder\node_modules\angular-cli\addon\ng2\commands\github-pages-deploy.ts:108:30)
    at lib$rsvp$$internal$$tryCatch (D:\theFolder\node_modules\rsvp\dist\rsvp.js:1036:16)
    at lib$rsvp$$internal$$invokeCallback (D:\theFolder\node_modules\rsvp\dist\rsvp.js:1048:17)
    at lib$rsvp$$internal$$publish (D:\theFolder\node_modules\rsvp\dist\rsvp.js:1019:11)
    at lib$rsvp$asap$$flush (D:\theFolder\node_modules\rsvp\dist\rsvp.js:1198:9)
    at _combinedTickCallback (internal/process/next_tick.js:67:7)
    at process._tickCallback (internal/process/next_tick.js:98:9)

`new BuildTask`` seems to depend on some outdated code...
see https://github.com/angular/angular-cli/blob/master/addon/ng2/commands/github-pages-deploy.ts#L71

Cheers!

[JohannesHoppe]

@filipesilva on #1070:
Oh wow, good catch! We didn't update github-pages-deploy.ts to use the new tasks. I'll put up a PR doing that.
It only really depends on the build task so the logic shouldn't be affected at all.
I updated #1633 to also fix that, since I had to edit it in that PR as well.

This bug can be closed, since the PR #1633 is supposed to fix ng github-pages:deploy.

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