Preparing for 5.0.0.beta3 release

Adds changelog headers for beta3 release

actioncable/CHANGELOG.md

@@ -1,3 +1,5 @@
+## Rails 5.0.0.beta3 (February 24, 2016) ##
+
 *  Added ActionCable::SubscriptionAdapter::EventedRedis.em_redis_connector/redis_connector and
    ActionCable::SubscriptionAdapter::Redis.redis_connector factory methods for redis connections, 
    so you can overwrite with your own initializers. This is used when you want to use different-than-standard Redis adapters,

actionmailer/CHANGELOG.md

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+## Rails 5.0.0.beta3 (February 24, 2016) ##
+
 *   Add support to fragment cache in Action Mailer.
 
     Now you can use fragment caching in your mailers views.

actionpack/CHANGELOG.md

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+## Rails 5.0.0.beta3 (February 24, 2016) ##
+
 *   Update session to have indifferent access across multiple requests.
 
         session[:deep][:hash] = "Magic"

actionview/CHANGELOG.md

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+## Rails 5.0.0.beta3 (February 24, 2016) ##
+
 *   Collection rendering can cache and fetch multiple partials at once.
 
     Collections rendered as:

activejob/CHANGELOG.md

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+## Rails 5.0.0.beta3 (February 24, 2016) ##
+
 *   Change the default adapter from inline to async. It's a better default as tests will then not mistakenly
     come to rely on behavior happening synchronously. This is especially important with things like jobs kicked off
     in Active Record lifecycle callbacks.

activemodel/CHANGELOG.md

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+## Rails 5.0.0.beta3 (February 24, 2016) ##
+
+*   No changes.
+
+
 ## Rails 5.0.0.beta2 (February 01, 2016) ##
 
 *   No changes.

activerecord/CHANGELOG.md

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+## Rails 5.0.0.beta3 (February 24, 2016) ##
+
 *   Ensure that mutations of the array returned from `ActiveRecord::Relation#to_a`
     do not affect the original relation, by returning a duplicate array each time.
 

activesupport/CHANGELOG.md

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+## Rails 5.0.0.beta3 (February 24, 2016) ##
+
 *   Deprecate arguments on `assert_nothing_raised`.
 
     `assert_nothing_raised` does not assert the arguments that have been passed

guides/CHANGELOG.md

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+## Rails 5.0.0.beta3 (February 24, 2016) ##
+
+*   No changes.
+
+
 ## Rails 5.0.0.beta2 (February 01, 2016) ##
 
 *   No changes.

railties/CHANGELOG.md

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+## Rails 5.0.0.beta3 (February 24, 2016) ##
+
 *   Alias `rake` with `rails_command` in the Rails Application Templates API
     following Rails 5 convention of preferring "rails" to "rake" to run tasks.