Grails version differences

I am finishing reading a book that I only now realized was written for Grails 1.1.1! We are on version 1.3.7 which seems light years away in Programming language terms. Could anyone give a distilled comparison between Grails versions? What new features sho开发者_Go百科uld I be aware that were added after 1.1.1?

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Each version ships with a set of Release Notes that outline the major changes. All of the major releases can be found on the Grails archive download page.

Reading through the latest documentation will probably help, too.