Updated Better Model Validation section
Merge pull request #175 from gfranko/master

Updated the Better Model Validation section
updated links for Backbone.Marionette to http://marionettejs.com
Merge pull request #176 from derickbailey/marionette-url

updated links for Backbone.Marionette to http://marionettejs.com
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Merge branch 'gh-pages' of github.com:sonico999/backbone-fundamentos into gh-pages