Build: Adopt UI download builder

[gabrielschulhof]

1. Gruntfile.js should be grabbing the version from <%= pkg.version %> instead
2. onBuildWrite() needs to look for @VERSION, not __version__
3. onBuildWrite() needs to remove the ( function( factory ) { if ( typeof define ... boilerplate, and construct an IIFE using the factory itself. This can be accomplished with esprima.

[arschmitz]

#2 and #3 are not needed. The @Version replacement is part of the release build along with striping the wrapper when we switch to ui download builder. The files we build here are just for development / testing. We wont be using these files for the cdn. The cdn will use download builder to generate its files. See the first 2 functions in https://github.com/jquery/jquery-ui/blob/master/build/release.js

[gabrielschulhof]

OK. It looks like the download builder will also be able to provide an implementation of --modules by replacing ":all:" with the list of modules requested at the command line, unless I've misread https://github.com/jquery/jquery-ui/blob/master/build/release.js#L41.

So, we can even get rid of onBuildWrite().

Come to think of it, shall we make this into an issue about adopting the UI download builder? I'd be happy to take that on.

[arschmitz]

Yes that sounds good.

[apsdehal]

@gabrielschulhof Any plans to pick this up again, it would require a lot of changes in the branch.

[Bachstelze]

Could we move this to the next milestone?