Eager loading made to use relation's in_clause_length instead of host's one (fixes #8474)
Test nested fields with AssociationProxy mockup & fix AssociationProxy support in form helper
Add rake test description

No behavior change
Inflector irregular singularize rules
Adding Back Rails::Engine::Railties#engines

Removing it breaks functionality with gems such as Thinking Sphinx.
This restores it with a deprecation warning. Closes #8551
Simplify code in AS json encoder
remove 'update' duplications
update assets guide code styling

* 1.9 hash syntax
* proper formatting around one line blocks
* do-end for multiline blocks
Clarified the minute option on DateTime#change
clearer conditional in constraint match check
Covering untested methods for ActiveModel::Errors
Specified jbuilder version
Merge pull request #8886 from rwz/specify-jbuilder-version

Specified jbuilder version
Changed if ! to unless
More consistent quotes in scaffold generator
Merge pull request #8887 from rwz/controller-scaffold-codestyle

Controller scaffold codestyle
thread_safe is a dependency of active_support
Use thor master to make rails work with Ruby 2.0
All green with Ruby 2.0 :green_heart:
Fix json params parsing regression for non-object JSON content.

Fixes #8845.