Item12474: replace yuicompressor with a better state-of-the-art tool

See the comments at http://www.yuiblog.com/blog/2012/10/16/state-of-yui-compressor/

The new jquery-2.0.0 won't compress anymore using yuicompressor.

Alternatives:

• https://github.com/mishoo/UglifyJS ... a nodjs wrapper ... works out of the box and gives better results than yuicompressor
• https://developers.google.com/closure/ ... this is a real compiler, not just a minifier, requires definitions of "externs" as it breaks you app potentially ... doesn't even work out of the box
• https://metacpan.org/module/JavaScript::Minifier ... very old and unmaintained

-- MichaelDaum - 19 Apr 2013

uglifyjs is excellent, works out of the box, is used by a lot of other javascript-related projects.

-- MichaelDaum - 14 May 2013

This also needs BuildContrib to be updated.

• Add optional dependency on http://nodejs.org/
• Add optional dependency on UglifyJS
• Add code to use UglifyJS if it's installed on the system.

And we should remove yuicompressor from the JQueryPlugin MANIFEST file.

This is blocking for 1.1.9.

-- GeorgeClark - 22 Oct 2013

Please leave yuicompressor where it is for now.

See also Item12614

-- MichaelDaum - 25 Oct 2013

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