i18n: Taking numberformatsymbolsext into account

[iamedu]

There are some errors in certain locale files, I noticed most latin american currencies were wrong. The problem is that closure library keeps a separate file numberformatsymbolsext.js for some languages.

This change uses this file too to generate the correct currency chars.

The locale generation process now downloads number format symbols from
this url too

http://closure-library.googlecode.com/svn/trunk/closure/goog/i18n/numberformatsymbolsext.js

Most locales should now be correct

[petebacondarwin]

LGTM

[IgorMinar]

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[iamedu]

Sorry, I have just signed the CLA right now!

[lisgiu]

We've got a similar problem for our application for Switzerland. The location-files for the French and Italian part aren't correct or are missing. This commit would solve our problem.
Will this proposed change be merged into the angular:master? Thanks.

[Narretz]

I guess this was handled by #9013 Better lat than never, right?